Philco 38-12 radio
Well just picked this radio up and seems to be common one and chanced turning it on using an inverter and it's got the typical buzzing that am radios have but it didn't pickup any stations but I'm going to recap it. I'll have to chance this after recapping because I have no clue if the tubes are good or not since these tubes are so early I gave away my tube tester that would have tested these now I have none to test them with. If anyone knows these radios , is there any known problems with these radios that need special attention.
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Like most of the starter Philco sets, I think this one is relatively simplistic. Just don't forget about the bakelite capacitor block, If I recall correctly, this set uses one
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Standard transformer powered five tube radio. Initial check procedure: Remove 84 rectifier tube and see if the rest of the tubes light up, of course with power applied. Replace the electrolytic caps and the coupling cap from the 75 plate to the 41 output tube. Make sure the two resistors are good in the bias line. Then try it! Tubes are the last things I worry about in a radio that basic. |
Schematic here:
https://www.google.com/search?q=phil...O2nPfkz-m59jM: I don't see any capacitor blocks... looks pretty simple. jr |
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I don't remember the resistors used in the radio. Just use the schematic from Nostalgia Air. |
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While this radio is really simple the schematic is not so clear as to the values of the resistors since some number 3s look like 5s because of ink bleed on the paper so I guess the best way is to try to compair the value of the resistor with what it shows on paper with adding more for drift. :yes:
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Philco is the one that started using the odd-at-the-time values of resistors, ie 47K instead of 50K, 2.2 K instead of 2K or 2.5K etc. They claimed that some color codes were hard distinguish under the then-new Mercury Vapor lighting, being used in their plant. |
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Most of the riders manuals were poorly scanned back in the 90's and no one ever bothered to fix that. The original books are much better, but the print is rather fine...One day I gotta get me the full paper riders.
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Let me know what ones you need. BTW, the N/A scans are pretty good. |
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