Posts: 62
Threads: 5
Joined: Apr 2021
City: CLARKSTON
State, Province, Country: MI
I went through the alignment again, verifying the signal generator frequency with a digital radio at each step. Basically same result, dial is 40kc low at 950, and 25kc low at 760. Couldn’t verify any stations high up on dial, as reception wasn’t good and stations I did pick up didn’t state call sign.
I verified that the oscillator was tracking correctly at 600kc, but found it was 50kc high at 1200 dial setting. I found oscillator at 1670kc when dial at 1150 (so oscillator at 520kc).
Would have to be a condenser issue I would think; this radio has Magnetic Tuning (AFC), but acts the same with it on or off, and I did verify that switch does short the AFC out, as does dial switch.
At least I know where to start looking. I did notice that the mixer 6A8 was microphonic...wish I had some others to try, as oscillator is same type.
(This post was last modified: 12-11-2021, 05:57 PM by RGK20m3.)
Messages In This Thread
RGK20m3 - by RGK20m3 - 12-11-2021, 05:41 PM
Users browsing this thread: 1 Guest(s)
|
Recent Posts
|
Restoration of the Canadian General Electric A-87
|
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 |
Restoration of the Canadian General Electric A-87
|
Great job on the cabinet.
PS. In the US notation, "kenotron" refers to specific type of tubes; we call re...morzh — 08:24 AM |
Part numbers to model cross
|
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 |
Restoration of the Canadian General Electric A-87
|
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 |
Restoration of the Canadian General Electric A-87
|
Well... While the varnish is drying up, I started repairing the chassis...
Of course I started by replacing the pa...RadioSvit — 07:12 AM |
Philco Model 38-7: what caps & resistors do fail typically?
|
Hello Martin,
Welcome aboard our little community what great Model 38-7
Sincerely Richardradiorich — 12:30 AM |
Philco Model 38-7: what caps & resistors do fail typically?
|
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 |
Part numbers to model cross
|
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 |
Philco Model 38-7: what caps & resistors do fail typically?
|
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 |
Philco 42-345 Restoration/Repair
|
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 |
Who's Online
|
There are currently 1126 online users. [Complete List] » 1 Member(s) | 1125 Guest(s)
|
|
|

|