18-12-2023, 07:03 PM
(This post was last modified: 18-12-2023, 07:07 PM by Mike Watterson.)
OK, 95 V on g2 is good.
So maybe someone twiddled.
Not far to to go now. If you even get to 10V on the detector, you could be content!
The amps seem practically like guitar amps. It seems designed to play organ music rather than being really HiFi. Strange for 1959-1962 ish, especially the VHF tuner which is like 1954.
I'm glad you are making incremental progress.
Do you know how to align FM IFs and the Ratio detector? Hint, without a wobbulator you just use the generator at 10.7 MHz with no modulation and measure voltage on the ratio detector and after main IF at 10.7 MHz, adjust generator +/- to see that ratio detector is correct.
Then put AM modulation as a final check. It should only give DC level and no audio.
Then adjust the VHF mixer/osc to be on frequency.
There should be detailed alignment procedure for that kind of detector somewhere. But in any case, you don't need AM or FM modulation on the generator to align FM IF or detector or RF.
The magic eye will fully close on a strong local station, even though very faded.
So maybe someone twiddled.
Not far to to go now. If you even get to 10V on the detector, you could be content!
The amps seem practically like guitar amps. It seems designed to play organ music rather than being really HiFi. Strange for 1959-1962 ish, especially the VHF tuner which is like 1954.
I'm glad you are making incremental progress.
Do you know how to align FM IFs and the Ratio detector? Hint, without a wobbulator you just use the generator at 10.7 MHz with no modulation and measure voltage on the ratio detector and after main IF at 10.7 MHz, adjust generator +/- to see that ratio detector is correct.
Then put AM modulation as a final check. It should only give DC level and no audio.
Then adjust the VHF mixer/osc to be on frequency.
There should be detailed alignment procedure for that kind of detector somewhere. But in any case, you don't need AM or FM modulation on the generator to align FM IF or detector or RF.
The magic eye will fully close on a strong local station, even though very faded.
