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Restoring Philco 37-620
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I'm restoring a 37-620 that belonged to my father, but hasn't been turned on in over 40 years.I last repaired it in 63, (replaced electrolytic to get rid of bad hum) and it worked for a couple of years.By following articles in your excellent web site, I have replaced all paper caps and resisters that were out of range and replaced a defective on/off switch and an open output audio transformer and much degraded wiring.I was able to get the original parts from Gary at Playthings of the past, a schematic from Chuck Schwark, grommets from Ed Schutz, and a new dial from Mark Oppat. Thank you guys for a rapid response to my orders. I next built a dim light rig (also found on your site) for turn-up. Progressed from a 15 watt bulb to a 100 watt bulb and am now receiving a couple of local stations with the 100 watt bulb in line. During voltage checks, I find with the 100 watt bulb in line, I have 97 volts AC being applied to the radio in-put. With this low line voltage, all my plate voltages that should be 240+, are around 110V and my 150 volts are around 80 volts. Are these voltages ballpark with this set up? I want to go direct with out the in-line 100 watt bulb, but thought I would seek a little advice first.
Second question, according to the alignment instructions, they use a Philco Model 025 Circuit tester, and connecting it between plate and cathode (grounded cathode) and using the 0-30 volt range. Does anyone know what this meter was. I have 240 volts on this plate to ground according to the schematic. Whats with the 0-30volt range on the test meter. Thanks in advance for any response, also for this site. I enjoy reading the many great articles, they bring back many good memories and have me thinking of electronic circuits I haven't thought of or even heard about in many years. Mike


Messages In This Thread
Restoring Philco 37-620 - by Guest - 02-26-2009, 10:26 AM
Re: Restoring Philco 37-620 - by AI2V - 02-26-2009, 12:07 PM
Re: Restoring Philco 37-620 - by Guest - 02-27-2009, 01:18 PM



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