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Philco 37-62 head scratcher
#1

Hi Everyone...my first restoration project here. Its fun working on the set until you change everything that is supposed to be changed and its still doesnt work, its still fun, but it leaves me scratching my head more. right now the unit hums when the volume it turned up, but no stations. Ive touched the grid of each tube and it buzzes on the 2nd detector/1st audio 6Q7G tube and none of the others. This I assume would indicate that audio section is good. (buzz in fact can be quite loud) I've replaced 3 tubes (det/osc, if, and rect) all bakelite and tubualar caps. I have inspected 1st and 2nd IF coils...wires are fine but none broken and contacts are good.
I can only think of one thing suspect at this point and would like to hear some feedback before prodeeding further. det/osc and IF screen grid voltage reads 125 volts... diagram indicates it shoud be around 85 volts. Resistor on the screen grid ((part 11) should be 25 K ohms, color code and markings indicate that is is a 15K ohm resistor. (meter reads about 18K) Interestingly there is a change note with the schematic that states that the resisitor should be changed to a 32 K ohm to eliminate oscillation. Why would there be a resistor of that value there beats me... or am I sniffing too much solder? could this value resistor and high screen voltage cause the hum and no receive?

I feel like im easter egging here but hope this makes sense, feedback appreciated. Thanks in advance


Messages In This Thread
Philco 37-62 head scratcher - by Guest - 02-13-2009, 08:59 PM
Re: Philco 37-62 head scratcher - by exray - 02-13-2009, 09:56 PM
Re: Philco 37-62 head scratcher - by Guest - 02-13-2009, 10:16 PM
Re: Philco 37-62 head scratcher - by exray - 02-13-2009, 10:47 PM
Re: Philco 37-62 head scratcher - by Guest - 02-13-2009, 11:19 PM
Re: Philco 37-62 head scratcher - by Texasrocker - 02-14-2009, 02:06 AM
Re: Philco 37-62 head scratcher - by exray - 02-14-2009, 08:21 AM
Re: Philco 37-62 head scratcher - by Guest - 02-15-2009, 06:50 PM
Re: Philco 37-62 head scratcher - by exray - 02-15-2009, 06:58 PM
Re: Philco 37-62 head scratcher - by Guest - 02-15-2009, 09:48 PM



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