Posts: 62
Threads: 5
Joined: Apr 2021
City: CLARKSTON
State, Province, Country: MI
Well...the power chassis is a mess. The interstage transformer has an open primary, one choke is open, and the AVC 6J5 is broken. Theory that I have is the filter cap shorted, which caused excessive current through the choke, which burned out. This is on the side with the candohm voltage divider resistors; if the choke goes open, no current flows, which means no bias voltage source. As the 6F6 driver is fixed bias and fed from the other power transformer, no bias caused excessive plate current, which burned out the interstage primary winding. Oh, well.....
Messages In This Thread
RE: 38-690 Code 125 - by RGK20m3 - 12-02-2021, 07:35 PM
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Recent Posts
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Restoration of the Canadian General Electric A-87
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| Thanks for your help Michael. In fact, this video is only an intermediate result. Later I had to apply another tinting l...RadioSvit — 09:01 AM |
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Restoration of the Canadian General Electric A-87
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| Great job on the cabinet.
PS. In the US notation, "kenotron" refers to specific type of tubes; we call re...morzh — 08:24 AM |
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Part numbers to model cross
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This document has at least some tables of models and parts used.
Example: Choke 32-7572, used in 604 radio.
Search f...morzh — 08:19 AM |
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Restoration of the Canadian General Electric A-87
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| I also checked all the radio tubes on my Hickok 530 tube tester. The 5Z3 kenotron turned out to be faulty, all the other...RadioSvit — 08:02 AM |
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Restoration of the Canadian General Electric A-87
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Well... While the varnish is drying up, I started repairing the chassis...
Of course I started by replacing the pa...RadioSvit — 07:12 AM |
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Philco Model 38-7: what caps & resistors do fail typically?
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| Hello Martin,
Welcome aboard our little community what great Model 38-7
Sincerely Richardradiorich — 12:30 AM |
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Philco Model 38-7: what caps & resistors do fail typically?
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| Welcome to the Phorum Martin.
I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM |
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Part numbers to model cross
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| Jim,
We have this index put together by Dale Cook but I don't think that is quite what you are looking for.
The Parts...klondike98 — 09:37 PM |
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Philco Model 38-7: what caps & resistors do fail typically?
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| Yep the dim bulb test is OK but I'd definitely replace all those electrolytics before I did it. Since those #47 conden...klondike98 — 09:18 PM |
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Philco 42-345 Restoration/Repair
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| The resistor is a 2.2 Meg, it was the last one I hadn't replaced. The broadcast is coming in after replacing it.osanders0311 — 09:09 PM |
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