tag:blogger.com,1999:blog-60208529331501064832024-03-20T01:25:00.788-07:00Stude Radio Rescue C-2971Rescue project for a Studebaker Transtar radio AC-2971 for Brian DahlStudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.comBlogger24125tag:blogger.com,1999:blog-6020852933150106483.post-33598103491883080452013-12-21T15:52:00.003-08:002013-12-21T15:52:39.514-08:00Radio Restore Complete!Installed the last tube, did a complete alignment using the antenna that will be used, and built the speaker cable.<br />
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-1448174071610501592013-12-20T12:40:00.002-08:002013-12-20T12:40:25.642-08:00Received Antenna TodayThis is the antenna that Brian had drop shiped to me from Studebaker International:<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge6c2fOAawY-Y-xBUAFVqJj5E4B3uDUrVPFMoUd0g1aDDoGY64GDThZMlH3r9LToMj2dUHcnBM_ZWI7FakWoAQsWc42N-hc694b47MRdz_xE8wl9fNnTtL5D6dDbkAgHyLNBjCBRdNglE/s1600/2013-12-20_14-03-17_496.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge6c2fOAawY-Y-xBUAFVqJj5E4B3uDUrVPFMoUd0g1aDDoGY64GDThZMlH3r9LToMj2dUHcnBM_ZWI7FakWoAQsWc42N-hc694b47MRdz_xE8wl9fNnTtL5D6dDbkAgHyLNBjCBRdNglE/s320/2013-12-20_14-03-17_496.jpg" width="320" /></a></div>
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-35927412046681010622013-12-19T16:39:00.000-08:002013-12-19T16:39:40.923-08:00New TransistorReplaced transistor<br />
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-44825538587189889522013-12-18T16:37:00.002-08:002013-12-18T16:37:20.553-08:00Tubes ArrivedFour of the five tubes came in.<br />
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-51515406962663874122013-12-18T09:32:00.002-08:002013-12-18T09:32:38.955-08:00New Tube Location GuideAdded a new tube location guide using MS PowerPoint, printing onto photo paper and laminating. It's not very much ike the original but it will do the job.<br />
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-1465995153397673962013-12-17T20:56:00.001-08:002013-12-17T20:56:34.245-08:00Another Tube Resource<br />
<a href="http://www.vacuumtubes.net/">http://www.vacuumtubes.net/</a><br />
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Ordered a 12AD6 from here. <br />
<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-87675356525931764152013-12-17T09:24:00.003-08:002013-12-17T09:26:10.369-08:00Alignment Info from Antique Radios Forum<br />
Here are the alignment instructions for the
similar Motorola CTA8X, which is the one that the SM9T Motorola page
refers to for everything except the schematic and the parts list, which
you have. A1, A2, A3, A4 are of course the IF adjustments. A5 is the
Osc trimmer, A6 is the RF trimmer, and A7 is the antenna trimmer on the
back of the radio. This information is from Sams AR-9 and component
labels may be different from Motorola labels. My Motorola manual is
missing the pages for CTA8X.
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<td class="row2" valign="top"><img alt="Motorola CTA8X alignment.jpg" height="443" src="http://antiqueradios.com/forums/download/file.php?id=62611" width="640" /></td></tr>
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-89161355291111403732013-12-15T19:11:00.002-08:002013-12-15T19:13:23.397-08:00Mounting Bracket, New Capacitors, Fuse Holder, Component Vibration PreventionI made an aluminum mounting bracket so that the radio can be mounted flush with the front surface of the dash:<br />
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High temperature RTV and foam pads added to reduce component vibration. Foam pads will help hold the upside down vacuum tubes in place:<br />
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New fuse holder and length of wire for power connection:<br />
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1/4-20 screw added for rear mounting: <br />
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StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-62651411167735513012013-12-13T18:53:00.001-08:002013-12-13T19:43:03.899-08:00Cow PastureOK, capacitor. I call large capacitors "Cow Pastures". I got this name for them from a an engineer colleague when I first started work at Melpar, E-Systems back in 1977. He was in charge of the AN/UIC-7 Digital Intercom System that was used in all the ground intercept systems. I digress...<br />
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To keep the radio looking original I gut the old filter capacitors and reuse the can to hold the new capacitors.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_0E3CHKcNpcR4HS-HnTcv74DEBDuDS-xKoGRuVgj5I1eLEveJ2kuGmfinoxyuI8Tvpx1P-vVrEKW0UulFhr0ZuBN1RtIfMlXmC0gmQuGX840nbHFFhMn_MbQLla93kTZdekhEu9Gii-o/s1600/2013-12-13_18-50-15_788.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_0E3CHKcNpcR4HS-HnTcv74DEBDuDS-xKoGRuVgj5I1eLEveJ2kuGmfinoxyuI8Tvpx1P-vVrEKW0UulFhr0ZuBN1RtIfMlXmC0gmQuGX840nbHFFhMn_MbQLla93kTZdekhEu9Gii-o/s1600/2013-12-13_18-50-15_788.jpg" width="400" /></a></div>
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Cow Pasture removed from chassis</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiW5VuTzCJUhNAO05N0CibWidIYj3KQtk5Q8v3G6A9X6BwVU55BXL2wGcUJw7q1N8XKjhwPGHSouNDeWmQqQsE603KxRHy64l1DLLrI5hSugVyWxtrOCeWrEVewL67bJb-NnqF0yNoF_nY/s1600/2013-12-13_18-50-26_215.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiW5VuTzCJUhNAO05N0CibWidIYj3KQtk5Q8v3G6A9X6BwVU55BXL2wGcUJw7q1N8XKjhwPGHSouNDeWmQqQsE603KxRHy64l1DLLrI5hSugVyWxtrOCeWrEVewL67bJb-NnqF0yNoF_nY/s1600/2013-12-13_18-50-26_215.jpg" width="400" /></a></div>
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The bandit</div>
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Odd to see a Motorola name on it, didn't think that they made Cow Pastures</div>
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So I start by grinding down the bottom edge to remove the mounting ring, bottom plate, and the guts.</div>
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Here are the three capacitors that replace the guts. Even Cow Pastures have gotten smaller.</div>
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New capacitors installed on the bottom plate. I made another plate from perf board to hold it all together with the help of epoxy.</div>
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Capacitor assembly test fitted</div>
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Completely assembled and epoxied and ready to go back into the radio after testing.</div>
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StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-73784410304521934892013-12-12T10:01:00.002-08:002013-12-12T10:01:40.073-08:00Parts From Play Things of the PastReceived vintage bias pots, IF Transformer, and knobs<br />
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<img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1RGHnw3e-6BNKICQHZhv1JN2wGsnGAiwbsorZ4ThjvnuL2_cdHJDK4XwyCrFbCJpiNg7QaHuWmNL5B3XRT7BQ_X1_WpV2goQq8Em7y6peiP4a_YTchbK5TYtQ6dYEa7nS5QnqatK5L_Q/s400/2013-12-12_12-17-24_808.jpg" width="400" /></div>
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Shipment</div>
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<img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjB6kl1su03Jj0tz2YrzN2LdfpiBHhapzD29sVZkCB-5Vnuz2jq1KSQSV5zYX4W398lSc3EPGv5gBtRzU6cF2syB0PaI7bLmIGiYohP7bOq82G79bMey6ohDA55gOfG0-P39t5CFgrdMeQ/s400/2013-12-12_12-18-04_94.jpg" width="400" /></div>
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Second IF Transformer</div>
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<img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgq9fbWJPLw1kLT17UcDoBX7OF82WWb4nMO3JpT1Zl7uXuz9NX0T790exHNbzCwwEGk3cKR4DM6_-l_qWI1WeDTcLTJIoBw6ZcUM_syCRMRRXBTYeYeqvYEk3YxTaSWt9Xycv9wFZVP02s/s400/2013-12-12_12-17-56_330.jpg" width="400" /></div>
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Three different Bias pots, one intermittent, 100 ohms and on 200 ohms</div>
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<img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRpRPPIONisGzibqKL_kqHaOQsFSBTXJ3dXxsq3MVB1LVpV-o9n_RnNBn_60w-QFwgKieCsSusEaB_uSuvja_uVJ2wO_if9j9p_g0PdOLALTuTcsbeY5hKNkP6SEecyURhDuXnQFj2jnI/s400/2013-12-12_12-17-37_118.jpg" width="400" /></div>
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One set of back knobs and two sets of front knobs</div>
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<img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge8J_1XhCQM12DMOj1hkU0RY2Eop1Y2-5ucAJwQxOH4WGTD6V9X1FSTEsPynYjMVFS1uErojWaYu_9rCbhf2vEsG_-79qB-TI18Zdz_Gv6fXYwaDemsbVjmsUBmSLDlLhf_rFybEAYg4I/s400/2013-12-12_12-18-31_859.jpg" width="400" /></div>
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Round knobs with back knobs</div>
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Flat faced knobs with back knobs</div>
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<img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghQPYVFa1rR-QEVg3oc9BDuDFuRdLnVCun4W6rg7VFJ4xj5sKPnDa7WyHSeJlvFXzf2bISbfxqnhfWZYlqYVohAiMgdlHeu391aholsn4SCWR1ysAQNzq_9A3Ufpk3SWCbDl4_CbItrKk/s400/2013-12-12_12-52-39_432.jpg" width="400" /></div>
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Flat faced knobs on radio</div>
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<img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjWS-CgNtlm_Rozs-28I89mg0ByJa2xWJfA2ZjVKo2_QdqF_H9CHdZ7YyeNKeaP_Rt1cJCite68D0uiWZOi7l39kxranQg42NKXTnGG30gU_p_4KtzY4mLfBZe28YTQCU8iP1z5gvnOy28/s400/2013-12-12_12-53-08_176.jpg" width="400" /></div>
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Round knobs on radio</div>
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StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-79722090880195207262013-12-09T07:52:00.003-08:002013-12-09T07:52:50.833-08:00Volume/Tone ControlI took apart the volume/tone control to clean the insides with hopes to clear up the scratchiness. Unfortunately it did not fix it but it helped a bit. This is a 2 meg volume with a 1 meg tap. the tone is 500K.<br />
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Control disassembled</div>
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Both tone and volume wipers are very worn</div>
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Volume shaft installed on element</div>
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Switch installed on volume control</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhj-7ghGz4wWmLe0wAunMjd-oKfbHNVWlNMRLGG9zY1uDuFbzv0lLxD4ESxsws2N9SqJ4Vcqrms87O4mJTXVRiF1kGkXqEeU-6jIDsatxZbZkaNWBbvdxCLbDbZwTBj-Mabtb9uRl7jMRE/s1600/2013-12-09_09-54-27_584.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="224" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhj-7ghGz4wWmLe0wAunMjd-oKfbHNVWlNMRLGG9zY1uDuFbzv0lLxD4ESxsws2N9SqJ4Vcqrms87O4mJTXVRiF1kGkXqEeU-6jIDsatxZbZkaNWBbvdxCLbDbZwTBj-Mabtb9uRl7jMRE/s400/2013-12-09_09-54-27_584.jpg" width="400" /></a></div>
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Tone shaft installed on element</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKbIlg_VVmV54gKoNhb3JOyFSmt49qIe4lJ0cLo5zjjwhq3VJwyt2GXFQUGVXkbQz70zPs8me1e1kmk3fptMSFxybg62kBVi8-Xlv4d1l7hkX4UoZxU8n2DbkxuLj6hIKJkrh_TgxXqJg/s1600/2013-12-09_09-56-01_453.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="224" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKbIlg_VVmV54gKoNhb3JOyFSmt49qIe4lJ0cLo5zjjwhq3VJwyt2GXFQUGVXkbQz70zPs8me1e1kmk3fptMSFxybg62kBVi8-Xlv4d1l7hkX4UoZxU8n2DbkxuLj6hIKJkrh_TgxXqJg/s400/2013-12-09_09-56-01_453.jpg" width="400" /></a></div>
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Coupling cover installed</div>
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Assembled control</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigWNeM7aZDliei6FJqRdoLq1ffR7ERmB7VGAAuKUSmcJA5-mEjjdE7tr5nfOLPPXBv-hXPIiT6o_cxXjyV3kCUSyYVC2cWUETr0T3ROSNOPbwTM4kQpezJfMQ0h4sZQ7Qy4U6MmP92EvI/s1600/120913062721.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><br /></a></div>
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StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-80948076419409911882013-12-06T10:41:00.002-08:002013-12-06T10:41:44.656-08:00Alignment Tools and Bezel Painting<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxJC1Oi_ygiwKLax0Ae5RvyNFuAwrKiW6fmMcUJX01FM__JK1aLS37xFCDrjXuaKjeZfWgH8vD6uevoFaAOEd8au70S09ePmTUVsUofxFtOqTzvBHDABOsWpSh5A7FIDiNQXt3c0D5zSQ/s1600/2013-12-06_13-26-08_495.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxJC1Oi_ygiwKLax0Ae5RvyNFuAwrKiW6fmMcUJX01FM__JK1aLS37xFCDrjXuaKjeZfWgH8vD6uevoFaAOEd8au70S09ePmTUVsUofxFtOqTzvBHDABOsWpSh5A7FIDiNQXt3c0D5zSQ/s400/2013-12-06_13-26-08_495.jpg" width="400" /></a></div>
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I think I bought a few more than I need... Well I'll be covered for any tuning that needs to be done.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicJjdmaIhfxNEXrvjksvtDJApxiVJe25s9A99gmzBHzJdjqSv1R2k_Yu-R41VFcrXioiYuawRSoZSmBtUAKFBOJUnmRr5VdinD1CqXO4pMBG9SgRpxImpwVg7JG49wBk9PM9NWPrB87KQ/s1600/2013-12-06_13-26-25_811.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicJjdmaIhfxNEXrvjksvtDJApxiVJe25s9A99gmzBHzJdjqSv1R2k_Yu-R41VFcrXioiYuawRSoZSmBtUAKFBOJUnmRr5VdinD1CqXO4pMBG9SgRpxImpwVg7JG49wBk9PM9NWPrB87KQ/s400/2013-12-06_13-26-25_811.jpg" width="400" /></a></div>
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Flat black painted bezel parts</div>
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-60628397595485705952013-12-06T10:15:00.002-08:002013-12-06T10:15:52.331-08:00Heat SinkToday I wanted to remove the lone power transistor and check the heat sink compound. I also decided to clean up the area. As suspected the compound was hard and dried up.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhP-16AYWR2G4ayaF3-k-Oi1_NS-ps6LEfkqmnJISb9sTKwZzphRg40p21gYT8F0x3r-kFZzhvnPsv5a17utoc8QCpKE8mkA7UXrkxtqMrDqUsQM0RKwaUYoHgHaYL2BJVsVC6RteWUqw/s1600/2013-12-06_10-21-55_697.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhP-16AYWR2G4ayaF3-k-Oi1_NS-ps6LEfkqmnJISb9sTKwZzphRg40p21gYT8F0x3r-kFZzhvnPsv5a17utoc8QCpKE8mkA7UXrkxtqMrDqUsQM0RKwaUYoHgHaYL2BJVsVC6RteWUqw/s400/2013-12-06_10-21-55_697.jpg" width="400" /></a></div>
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Lone power transistor and heat sink</div>
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Transistor removed</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhA0yT9-jmcitjV5bp2ybWB2BP0hBCGQRhLvkFlkFwR8iIX9l8UIazw7gXwTyBdtqeDMbfIOQCDO6rmh6jMYUDeaBnvIqP9AxoIiEB5mHwlMN5Ekp57sLlTtFeAv4lEZMx3OHWvwk7mqsw/s1600/2013-12-06_11-32-57_423.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhA0yT9-jmcitjV5bp2ybWB2BP0hBCGQRhLvkFlkFwR8iIX9l8UIazw7gXwTyBdtqeDMbfIOQCDO6rmh6jMYUDeaBnvIqP9AxoIiEB5mHwlMN5Ekp57sLlTtFeAv4lEZMx3OHWvwk7mqsw/s400/2013-12-06_11-32-57_423.jpg" width="400" /></a></div>
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Parts cleaned and ready for installation of transistor</div>
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Heat sink compound, insulator, and transistor</div>
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Transistor coated, insulator installed and insulator coated</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiv41Tjy_q9aClK_wXjBSNfhZS-B4ppuEv5X2f9F0PrJT2D-KksHPnxSAW96o_yvo29J6Jf0-dMmlSLd3t6UUFBfSwa2Zf8qEtKbvK1wUKeKPcg8bCANtoIl9jexOfDeg4Fb98gUQAo4cU/s1600/2013-12-06_11-42-38_83.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiv41Tjy_q9aClK_wXjBSNfhZS-B4ppuEv5X2f9F0PrJT2D-KksHPnxSAW96o_yvo29J6Jf0-dMmlSLd3t6UUFBfSwa2Zf8qEtKbvK1wUKeKPcg8bCANtoIl9jexOfDeg4Fb98gUQAo4cU/s400/2013-12-06_11-42-38_83.jpg" width="400" /></a></div>
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Transistor re-installed.</div>
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-66779233567791120012013-12-05T20:54:00.001-08:002013-12-05T20:54:27.160-08:00Filter Caps Ordered<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYqdX_ibAQ7PFRQfc7UktusO7jv6jXprAH04kXN_IrDgAwJI8yrkDcZfXAmNkzbiJ-5Y-9QGPBYms07Sw7FxhTzmFvrFMNuJ8FVaZNvbmyHGtkXq5oCC6Gfpjpq99KXtX2X9NIwRuntWA/s1600/Digikey.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="184" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYqdX_ibAQ7PFRQfc7UktusO7jv6jXprAH04kXN_IrDgAwJI8yrkDcZfXAmNkzbiJ-5Y-9QGPBYms07Sw7FxhTzmFvrFMNuJ8FVaZNvbmyHGtkXq5oCC6Gfpjpq99KXtX2X9NIwRuntWA/s640/Digikey.jpg" width="640" /></a></div>
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Last item does not count, the connector is for my signal generator</div>
StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-11123828965166248112013-12-05T19:27:00.001-08:002013-12-05T19:27:37.913-08:00Tubes Ordered<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhaehCFGsOPSY8JmtCp3MTNoU3S1gZgadTbgydiJXFuy-25_FULBf_oM_JzYCz-5BOlja75N0v4LzANj7pWfvCdsYrTrgGuq-mNz1xq9xWMPIKghrd-Mn9LyeHS1L2aHTaCF_uGcoyjvJY/s1600/TubeOrder.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="457" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhaehCFGsOPSY8JmtCp3MTNoU3S1gZgadTbgydiJXFuy-25_FULBf_oM_JzYCz-5BOlja75N0v4LzANj7pWfvCdsYrTrgGuq-mNz1xq9xWMPIKghrd-Mn9LyeHS1L2aHTaCF_uGcoyjvJY/s640/TubeOrder.jpg" width="640" /></a></div>
<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-17140970338497866192013-12-05T19:08:00.001-08:002013-12-05T19:08:39.720-08:00New tuning Clutch and Tuning U-Joint<div style="text-align: left;">
Today I replaced the tuning clutch disc and U-joint disc. Both are made out of rubber that has dried up and started cracking. These will just need to be replaced later so it is best to replace them now.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6lMTugfU51CEGKgux4JRNO2PhMf1YFB1DkWNMlcN5u2BfaApPpo7GPoxVdp6tgtXGxTY16Y6q2HUvjxJd1IDuVlDZH04jqC20zud_WGDZP9qPJmNCIamQrYW2rDMlxZPSJ8_3ir8p5ZM/s1600/2013-12-05_10-06-20_360.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6lMTugfU51CEGKgux4JRNO2PhMf1YFB1DkWNMlcN5u2BfaApPpo7GPoxVdp6tgtXGxTY16Y6q2HUvjxJd1IDuVlDZH04jqC20zud_WGDZP9qPJmNCIamQrYW2rDMlxZPSJ8_3ir8p5ZM/s400/2013-12-05_10-06-20_360.jpg" width="400" /></a></div>
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Removing tuner section. Front of radio just unbolts from the chassis and the eight connecting wires were unsoldered.</div>
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Tuner section removed</div>
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Old tuning clutch. This clutch is used to disengage the tuning knob when station selector buttons are pushed. Rubber clutch is all dried out and cracked.</div>
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Tuning components removed</div>
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Old U-joint made from cloth reinforced rubber cracked in several places</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKqJ488Cx1UJHhlabBvSBrR8Pav8srI1K9M5ECHqegptLoIZaaYqLmtVEvQCOxDsNfz4hleTqkoQYoUooMPd40VUnZMhincLMLgoJ7CBhwPxyRmvm1N1cpcb55VhMGusybPr5oN_K0hcM/s1600/2013-12-05_10-17-24_909.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKqJ488Cx1UJHhlabBvSBrR8Pav8srI1K9M5ECHqegptLoIZaaYqLmtVEvQCOxDsNfz4hleTqkoQYoUooMPd40VUnZMhincLMLgoJ7CBhwPxyRmvm1N1cpcb55VhMGusybPr5oN_K0hcM/s400/2013-12-05_10-17-24_909.jpg" width="400" /></a></div>
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Note clutch rubber falling out of assembly</div>
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Outer clutch disc crimped is crimped onto the shaft</div>
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Filing off the crimp to get the clutch disc off</div>
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I drilled and tapped the shaft end for a 4-40 SS screw</div>
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Test fitting the clutch disc mounted with screw</div>
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Spraying neoprene rubber clutch disc pads and clutch discs with contact cement</div>
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Applied the rubber pads to the clutch discs and pressing until dry</div>
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Old U-joint</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJWgeSpMoKfAApr4SwYfO18eAhgr37pqlUQVTtS67swu95ORFERIQN2FCqk5TXb3sZAXLb5ysrQHjLHRwTsYWj4ronRgIbGcmQVC8CHFBTQz0YsrxdIL3pJDOnSQvY-KjSAJHRUf9HkUU/s1600/2013-12-05_18-29-12_617.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJWgeSpMoKfAApr4SwYfO18eAhgr37pqlUQVTtS67swu95ORFERIQN2FCqk5TXb3sZAXLb5ysrQHjLHRwTsYWj4ronRgIbGcmQVC8CHFBTQz0YsrxdIL3pJDOnSQvY-KjSAJHRUf9HkUU/s400/2013-12-05_18-29-12_617.jpg" width="400" /></a></div>
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Old U-joint with rivets drilled off</div>
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New neoprene U-joint disc</div>
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New U-joint assembled</div>
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Tuning components installed and tuner section installed in radio</div>
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Installed U-joint</div>
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-43045164434959547562013-12-03T09:11:00.002-08:002013-12-04T11:51:21.846-08:00YAY!!<div style="text-align: center;">
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<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.blogger.com/video.g?token=AD6v5dxT_xl_5NumyN4u77uKt9mgIAWB5C7230XY97mqLYhZifdYhi_ZivKHhBAQrPEl17uhSA8Cca7NXIEDKEXv6w' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div>
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I temorarily added a filter capacitor to reduce hum from my battery charger. Those higher wattage resistors are replacing a trimmer potentiometer.</div>
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Here is the old trimmer potentiometer that adjust the output transistor bias current. It is dead. Looked on Digikey, apparently this type is no longer being made. I can just pick and choose fixed resistors to get the bias correct or find another potentiometer that would work. This is a 125 Ohm potentiometer.</div>
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Control shaft detail<br />
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Found a pot at Newark for $11.14. Not exact fit but a better part and it will do the job well:</div>
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<img alt="" height="320" id="productMainImage" src="http://www.newark.com/productimages/standard/en_US/4468694.jpg" title="MULTICOMP-MCWWPT-10-101-LF-TRIMMER, POT 100 OHM -000TURN Panel" width="264" /> </div>
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-26833513313528549402013-12-02T19:02:00.000-08:002013-12-02T19:02:11.554-08:00Problem #1Got the schematic today from Brian and started a little debug. I knew that the output transistor and the 12K5 tube driving the transistor was working so I started checking voltages at the detector stage. All looked good at the detector so I went to the last IF amplifier stage and found that the plate voltage was zero. Checked the voltage on the other end of the IF transformer primary winding and found 12 volts. It appeared that the primary winding was open so I removed the IF transformer and did find a broken wire. Not sure what happened to the transformer but it looks like the wire was eaten. There was about 1" missing. So I installed a jumper wire and found that the "sort of plastic" base was crumbling. I pulled out the epoxy and patched it up. Tomorrow I'll put the transformer guts back in it's case and reinstall it. Not the best of situations but that is sometimes the way it goes. The likeliness of finding a good replacement transformer is somewhere between nil and zero...<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVgkXMJ4qqNA7h-tAr64bnDfqRAj9es9jlitAvHNukaxy9TeyGwKWstQBLjqkQBoArroBWMqC2gKIXTMUdhmH9F-gzI3fkKVCLUNLzGyC81Di2ebMEp2ZfTqxgPQDXjqpzHpIV5KeNd0k/s1600/2013-12-02_18-45-59_575.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVgkXMJ4qqNA7h-tAr64bnDfqRAj9es9jlitAvHNukaxy9TeyGwKWstQBLjqkQBoArroBWMqC2gKIXTMUdhmH9F-gzI3fkKVCLUNLzGyC81Di2ebMEp2ZfTqxgPQDXjqpzHpIV5KeNd0k/s400/2013-12-02_18-45-59_575.jpg" width="400" /></a></div>
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Here is the bottom of the chassis showing the bottom of the transformer</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaihSRGihYeK9l4hEE-4qVNmu0bqY9opzXk2k6mdCnwbSmM0yfwvrk11rIphgBUFGmfHk0jpB8BoE5jr3JpFAT5v5rgQZMKchLoyJqEv5e4N5Aky5IZPgnPSM-2ujfLVonUtW8zaf4Y4Q/s1600/2013-12-02_19-08-48_370.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaihSRGihYeK9l4hEE-4qVNmu0bqY9opzXk2k6mdCnwbSmM0yfwvrk11rIphgBUFGmfHk0jpB8BoE5jr3JpFAT5v5rgQZMKchLoyJqEv5e4N5Aky5IZPgnPSM-2ujfLVonUtW8zaf4Y4Q/s400/2013-12-02_19-08-48_370.jpg" width="224" /></a></div>
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Transformer removed</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhCnBFAb-lhSxBt2tk4wkjRU-EuvImRu3IROsyvyQemTVdFQpFuicN1fA2_vzNXjjiy3IzCW1E4CxwzX129E2gazHtEeqP2hSQFaLQs_fZyTIdeEPJcm_FFv1W3eHfu3N50adwo_ZYbu-A/s1600/2013-12-02_19-11-59_229.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhCnBFAb-lhSxBt2tk4wkjRU-EuvImRu3IROsyvyQemTVdFQpFuicN1fA2_vzNXjjiy3IzCW1E4CxwzX129E2gazHtEeqP2hSQFaLQs_fZyTIdeEPJcm_FFv1W3eHfu3N50adwo_ZYbu-A/s400/2013-12-02_19-11-59_229.jpg" width="400" /></a></div>
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Transformer guts removed from it's case</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIg3y_4QVwR0nFQlFUTvrg1n7olmxnfX7r2LJ8kdjqcmerIeeYr6Pv6F5PZTsLXkgz4m3E9G-I5TwnO6y2wkR2bjaJICEVTAXIIBRWpk41DBTPtFT8D1BSOClYg7yn2nwgfsksBNsHi9M/s1600/2013-12-02_19-39-36_37.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIg3y_4QVwR0nFQlFUTvrg1n7olmxnfX7r2LJ8kdjqcmerIeeYr6Pv6F5PZTsLXkgz4m3E9G-I5TwnO6y2wkR2bjaJICEVTAXIIBRWpk41DBTPtFT8D1BSOClYg7yn2nwgfsksBNsHi9M/s400/2013-12-02_19-39-36_37.jpg" width="223" /></a></div>
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Guts with the added jumper wire and a bunch of epoxy slathered all over the base.</div>
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-67621273985298729092013-12-02T12:47:00.001-08:002013-12-02T12:47:05.428-08:00Schematic<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5X3AFK7Grh7p-ISHn_8em7uZukhr1BpC2Vs24q0ySzhawG9anrAqzSHnHJ-OWLH8S-32_JfpCiZTuO0U5Spt6Q41c7UzpdiLKzBUhhQc_6kYmObnBrhP0AMBAQIsQ0zGqbaMdXqSuV9g/s1600/Larger.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="371" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5X3AFK7Grh7p-ISHn_8em7uZukhr1BpC2Vs24q0ySzhawG9anrAqzSHnHJ-OWLH8S-32_JfpCiZTuO0U5Spt6Q41c7UzpdiLKzBUhhQc_6kYmObnBrhP0AMBAQIsQ0zGqbaMdXqSuV9g/s640/Larger.jpg" width="640" /></a></div>
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-37843243100348420102013-12-02T12:24:00.000-08:002013-12-02T12:24:02.721-08:00Some Cleaning<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-lk12BOyS3gnZxco0CiXM1QN-_x4qnZZfW-worSljFrw3TWGT-9HOXkkSUbloKcL1CzV9BvpEPbj4oGnguW1sbSEgsnt4W8R1yu8dsc8z6c63cvt6aAitLVV9k_IKHffnQaDI9vEVpvc/s1600/2013-12-02_14-53-21_955.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-lk12BOyS3gnZxco0CiXM1QN-_x4qnZZfW-worSljFrw3TWGT-9HOXkkSUbloKcL1CzV9BvpEPbj4oGnguW1sbSEgsnt4W8R1yu8dsc8z6c63cvt6aAitLVV9k_IKHffnQaDI9vEVpvc/s400/2013-12-02_14-53-21_955.jpg" width="400" /></a></div>
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Bezel straightened and cleaned up with the knob echelons</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYm0sUe9hqBGY19kO_RBZDXG2K1sI08SySoR2nHo4tvI-OfpFfDWS30B34snxzCvl32JoCeGXA0I1C0DqCb5GApYGcitcCWbvDgCgUQK6REle0l9s10va2X7CL_Ph-bXGGP638ZqJQc8Y/s1600/2013-12-02_14-53-47_447.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYm0sUe9hqBGY19kO_RBZDXG2K1sI08SySoR2nHo4tvI-OfpFfDWS30B34snxzCvl32JoCeGXA0I1C0DqCb5GApYGcitcCWbvDgCgUQK6REle0l9s10va2X7CL_Ph-bXGGP638ZqJQc8Y/s400/2013-12-02_14-53-47_447.jpg" width="400" /></a></div>
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Top and bottom cover cleaned up. I went over these lightly with a wire wheel so as to not remove to much of the plating but remove the rust. Then a coat of paste wax.</div>
<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-24734483595365325682013-12-01T17:39:00.002-08:002013-12-04T08:13:30.447-08:00More TubesFound this awesome site that has NOS tubes: <a href="http://www.tubedepot.com/">http://www.tubedepot.com</a><br />
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Here are their prices:<br />
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Tube Type Cost Each QTY Total<br />
<span style="font-family: "Courier New",Courier,monospace;">12K5 $6.95 1 $6.95</span><br />
<span style="font-family: "Courier New",Courier,monospace;">12AD6 $3.95 1 $3.95</span><br />
<span style="font-family: "Courier New",Courier,monospace;">12BL6 $3.95 2 $7.90</span><br />
<span style="font-family: "Courier New",Courier,monospace;">12F8 $3.95 1 <u> $3.95</u></span><br />
<span style="font-family: "Courier New",Courier,monospace;"> $22.75 + shipping</span><br />
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<span style="font-family: inherit;">Don't know yet if any are needed yet but it is nice to see a source for these space charged tubes.</span>StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-65739749784648735642013-11-30T17:48:00.002-08:002013-11-30T18:10:36.915-08:00The Tubes<div class="separator" style="clear: both; text-align: left;">
Awesome tube reference: <a href="http://frank.pocnet.net/">http://frank.pocnet.net/</a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEik0ROGmFQu6cjn09OZAD2RmE-Hae-9JK8T9KBXNFcCZvZrltyLGPD_C-MEJYYgkeG_UQsPVljxWszlqu_ih43o4j3fBwlFNF1z4Xy8JGNRBvtDdZnrcZQE78GDn-fN6B5HSwR0440r3WI/s1600/12K5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="441" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEik0ROGmFQu6cjn09OZAD2RmE-Hae-9JK8T9KBXNFcCZvZrltyLGPD_C-MEJYYgkeG_UQsPVljxWszlqu_ih43o4j3fBwlFNF1z4Xy8JGNRBvtDdZnrcZQE78GDn-fN6B5HSwR0440r3WI/s640/12K5.jpg" width="640" /></a></div>
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<a href="http://www.radiomuseum.org/tubes/tube_12k5.html">http://www.radiomuseum.org/tubes/tube_12k5.html</a><br />
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<a href="http://frank.pocnet.net/sheets/137/1/12K5.pdf">http://frank.pocnet.net/sheets/137/1/12K5.pdf</a> </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZcWgDtN206511M3jR2rrfnNUcXK4n85diURXtzZlF-sW7G2fyddvTF26wm4WlwG8Tl6noJVlVefR-KQKIbJQ3cg_pRh3oIq5-z02BvvlxnayMUa8OwkogHNm6mrcY7qhlNvnRAnB6lV4/s1600/12AD6.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="507" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZcWgDtN206511M3jR2rrfnNUcXK4n85diURXtzZlF-sW7G2fyddvTF26wm4WlwG8Tl6noJVlVefR-KQKIbJQ3cg_pRh3oIq5-z02BvvlxnayMUa8OwkogHNm6mrcY7qhlNvnRAnB6lV4/s640/12AD6.jpg" width="640" /></a></div>
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<a href="http://www.radiomuseum.org/tubes/tube_12ad6.html">http://www.radiomuseum.org/tubes/tube_12ad6.html</a><br />
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<a href="http://frank.pocnet.net/sheets/093/1/12AD6.pdf">http://frank.pocnet.net/sheets/093/1/12AD6.pdf</a> </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEim9AytOPxbxKUoCRVMW26mbMs2XDVW3teLFJ0dHKuUKyDFdhnxfclKMFlJuxFJuGyZBHKAviMCSVaiZXXNDuhhQnyaOONcQuS5EbPUM0lMGCh1QY_qI0vKUnFd2pfx4jVmQIA96LlFtxc/s1600/12BL6.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="443" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEim9AytOPxbxKUoCRVMW26mbMs2XDVW3teLFJ0dHKuUKyDFdhnxfclKMFlJuxFJuGyZBHKAviMCSVaiZXXNDuhhQnyaOONcQuS5EbPUM0lMGCh1QY_qI0vKUnFd2pfx4jVmQIA96LlFtxc/s640/12BL6.jpg" width="640" /></a></div>
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<a href="http://www.radiomuseum.org/tubes/tube_12bl6.html">http://www.radiomuseum.org/tubes/tube_12bl6.html</a></div>
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<a href="http://frank.pocnet.net/sheets/093/1/12BL6.pdf">http://frank.pocnet.net/sheets/093/1/12BL6.pdf</a><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3gWHm17iDtEoRwgzabMMlp8e0iAmEEJPbjeZvsDzSl_MR8dLb60z2llGyppNfPYpbL0fQpTd8_i34-MzAnRXNVK6dQzgQSpFESaMyGdWcBsh7Kxki9D3OrC2IfBItrYIEgxo9fd_s2Tc/s1600/12F8.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="500" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3gWHm17iDtEoRwgzabMMlp8e0iAmEEJPbjeZvsDzSl_MR8dLb60z2llGyppNfPYpbL0fQpTd8_i34-MzAnRXNVK6dQzgQSpFESaMyGdWcBsh7Kxki9D3OrC2IfBItrYIEgxo9fd_s2Tc/s640/12F8.jpg" width="640" /></a></div>
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<a href="http://www.radiomuseum.org/tubes/tube_12f8.html">http://www.radiomuseum.org/tubes/tube_12f8.html</a><br />
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<a href="http://frank.pocnet.net/sheets/137/1/12F8.pdf">http://frank.pocnet.net/sheets/137/1/12F8.pdf</a> </div>
StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-88862394623587049382013-11-30T17:20:00.001-08:002013-11-30T17:55:40.572-08:00Video!!I removed the echelon glass, cleaned it and put it together temporarily to see how well it will look. The good news is that the silk screen on the glass is in perfect condition.<br />
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Here are a couple of videos:<br />
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<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.blogger.com/video.g?token=AD6v5dzPzvCg3zmPptOoGMoD73vJq9rXjADbp0wmi2BIkbbdpQX_f63X4qKtTfidhGXH-vFGgVw0h5xDwDeeTLwR8Q' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div>
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<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.blogger.com/video.g?token=AD6v5dxcpAHgXw_RlgFS1vyXhOYoIgop6c42GcyAefmO7-YY6PNJcZcAvI1t6tmWKclQZmcZ-4LD9LL5y15Ms0EQCA' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div>
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0tag:blogger.com,1999:blog-6020852933150106483.post-49330968091101356962013-11-30T15:25:00.001-08:002013-11-30T15:25:31.035-08:00Radio DeliveredWhile starting the restore of Studebaker AC-2905 radio (<a href="http://studeradiorescueac-2905.blogspot.com/">AC-2905 Restore</a>), Brian found a more desirable radio for his Transtar truck. In anticipation of starting the restore Brian sent me a couple of pictures. The first thing I noticed was a big power transistor on the side of the radio and thought that this will be a more modern transistor radio. But this is not to be. Interestingly, looking inside the radio we find several tubes. So this radio is an odd hybrid. After checking it out some more I then find that the lone power transistor is the audio output transistor not the vibrator replacement. On further analysis I find that the tubes are the very odd 12 volt type!! Normally vacuum tubes require a high voltage to operate, in the order of 100 to 200 volts. These tubes that were developed on the verge of the development of the transistor could operate on 12 volts!!<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyQzw45VaHavq135O557jELGi_debbDLPRnLRvdAVnnQBIcPQ4XYV50vry9wqQrV4e7aEIHqZk_nDTIgfjSpMyHzxVka03DXUYB6qdPo0rYD0lLxpqVWiAnfO8jEhcUcOY97s65gUSZSE/s1600/photo2.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyQzw45VaHavq135O557jELGi_debbDLPRnLRvdAVnnQBIcPQ4XYV50vry9wqQrV4e7aEIHqZk_nDTIgfjSpMyHzxVka03DXUYB6qdPo0rYD0lLxpqVWiAnfO8jEhcUcOY97s65gUSZSE/s400/photo2.JPG" width="400" /></a></div>
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Top of radio and spare fuse holder that Brian provided</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-9aSZpXZ2IL2GImAp7KIn2lIInAc_kzCpBqQVduWZ1WTrkrGsbD5-_DwVSH-J3IqFgYFV9C2QRtgg3MsNwxLTLg7a-xSg80MmHSvOEFMtFoCDl96B5f4EdGqkGOxHTUkzo5TOnKejSP0/s1600/photo3.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-9aSZpXZ2IL2GImAp7KIn2lIInAc_kzCpBqQVduWZ1WTrkrGsbD5-_DwVSH-J3IqFgYFV9C2QRtgg3MsNwxLTLg7a-xSg80MmHSvOEFMtFoCDl96B5f4EdGqkGOxHTUkzo5TOnKejSP0/s400/photo3.JPG" width="400" /></a></div>
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Front with one of it's teeth pushed in</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVZdisdnRtVhFhULkqNmhjWcHeqYkMeY0CDEvOTYq6BWzOw9Exujl0CvfFFvXlJnRerjBvbZ1Bd12E8KhbvJtRa6JyPEvicNdnTi_MxpRbfebXPZsiw6ZTAkwOhO20gEqeGipAaO7TUic/s1600/photo4.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVZdisdnRtVhFhULkqNmhjWcHeqYkMeY0CDEvOTYq6BWzOw9Exujl0CvfFFvXlJnRerjBvbZ1Bd12E8KhbvJtRa6JyPEvicNdnTi_MxpRbfebXPZsiw6ZTAkwOhO20gEqeGipAaO7TUic/s400/photo4.JPG" width="400" /></a></div>
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Brian did some cleaning</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJrx7TAsMYCF73xF1sk6PufmnIIjQnJe1C-Th9yy2abHW2GrOHt5cwqHHt7owwuCXMOwgBm5cRBxHKpD1GEwrwHE5inaJjITxhkywSEtv6XOEtMnL-zOWh5U199lK3rkc0UI_0m9ZSZjA/s1600/photo+1.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJrx7TAsMYCF73xF1sk6PufmnIIjQnJe1C-Th9yy2abHW2GrOHt5cwqHHt7owwuCXMOwgBm5cRBxHKpD1GEwrwHE5inaJjITxhkywSEtv6XOEtMnL-zOWh5U199lK3rkc0UI_0m9ZSZjA/s400/photo+1.JPG" width="400" /></a></div>
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Volume/tone control shafts</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4E-uoI0zrTdiApwS068FpQKBfACv6QIxckJnIcSvJxQZ0ZuCP5OPQXiq7PI1_hYbD-9xsQHL7M_xjH9KQ78bAjRabT1nscBkd3wWKQba4Ltac7EkYXnsuXNJ-9k8kJmRdEmIzrYuTIT8/s1600/photo+5.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4E-uoI0zrTdiApwS068FpQKBfACv6QIxckJnIcSvJxQZ0ZuCP5OPQXiq7PI1_hYbD-9xsQHL7M_xjH9KQ78bAjRabT1nscBkd3wWKQba4Ltac7EkYXnsuXNJ-9k8kJmRdEmIzrYuTIT8/s400/photo+5.JPG" width="400" /></a></div>
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Motorola Model number SM9T</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_E3pNszz7Y3qPRKzwRMdLO55tZIcq4lFHhNIYEhBAriV8gM1881YzXZXRGgzF3td1QhxAW2Pikb6QFxobhkglzP6k6rBCTTmZgKgDX41DvEJmn9bhZv97dsqL-lOa4O5_D6-rvnUwSi4/s1600/photo+6.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_E3pNszz7Y3qPRKzwRMdLO55tZIcq4lFHhNIYEhBAriV8gM1881YzXZXRGgzF3td1QhxAW2Pikb6QFxobhkglzP6k6rBCTTmZgKgDX41DvEJmn9bhZv97dsqL-lOa4O5_D6-rvnUwSi4/s400/photo+6.JPG" width="400" /></a></div>
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Front cover removed</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhYNTI65fGpt0-C5cj42d0Lt_JAbt8waaXtdudAJuzn6JZ1iAgsr3yNSDxyeudc3yGJ0dgR7Smauq5HME3n6QKohCRFHllm4nNWvLY9ccfrdYfWYrTiOkko-ZKPk6bHix3YHM7MIVRw7nA/s1600/photo+7.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhYNTI65fGpt0-C5cj42d0Lt_JAbt8waaXtdudAJuzn6JZ1iAgsr3yNSDxyeudc3yGJ0dgR7Smauq5HME3n6QKohCRFHllm4nNWvLY9ccfrdYfWYrTiOkko-ZKPk6bHix3YHM7MIVRw7nA/s400/photo+7.JPG" width="400" /></a></div>
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See that big power transistor on the side?</div>
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Back side</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNburdYihs2Z5yIqIvveaKFJtIipaNlzepYccutMWrhZK5vcAkX_Sp_vyEXRKtQsVww03sYU7FYO-nJv7uf4dSUNDcByEI3eyosAC-T3IuAYSV3rvynsiQmPJwFmqCoW2vEpY8-V83Ykg/s1600/photo+9.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNburdYihs2Z5yIqIvveaKFJtIipaNlzepYccutMWrhZK5vcAkX_Sp_vyEXRKtQsVww03sYU7FYO-nJv7uf4dSUNDcByEI3eyosAC-T3IuAYSV3rvynsiQmPJwFmqCoW2vEpY8-V83Ykg/s400/photo+9.JPG" width="400" /></a></div>
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Top</div>
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Closeup of the power transistor</div>
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Comparing the two bezels. Note that the dial is backwards on the Transtar radio. On normal radios the dial goes from left to right, 550 KHz to 1600 KHz.</div>
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Lots of dirt in the top</div>
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Bottom fairly dirty also. The tube on the bench to the left was just sitting in the radio. The sockets do seem very loose and for some reason they mount the tubes upside down in the chassis. Maybe they wanted the tubes to fall out?</div>
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Update: I did some more testing and was able to get some noise out of the speaker so it looks like the power transistor output stage is working. Can't say much for the rest of the radio. In several days when Brian gets the schematic to me I'll be able to do some more in depth testing and maybe get this puppy to put out some tunes!!!</div>
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<br />StudeM15A-20http://www.blogger.com/profile/16283002612367815929noreply@blogger.com0