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So I have now taken apart all the tuning condensers as Chas has suggested. The frames are a bit rusted and even some of the fins and spacers did appear to have some corrosion so I buffed all the fins where they would contact the spacers and buffed the spacers too. It’s all constructed with aluminum plates and spacers so no dissimilar metals. I hear no difference. I’ve cleaned all the pins on all the tubes and cleaned all contacts where the tubes plug in. I’ve scanned for spurious oscillations with a transistor radio, no improvement. The station I had on the transistor radio was the same one I can get on the AK and the transistor radio did get a bump in volume when held close to the AK and then goes back to normal after turning the AK off or turning the tuning knob. I even scoped looking for oscillations. Tried higher then lower grid resistor values, same with grid leak resistor. Fiddled with synchronizing of the 3 tuning condensers and got the one station I receive a tad better. So now back to thinking a set of new tubes to try would be next but I’m not spending any more $$ on this set! I don’t know if it’s worth experimenting with changing from a grid leak to a diode detector with getting only one station that’s on the weak side.
Ron
Bendix 0626. RCA T64 Philco 20B
Philco 41-250. Philco49-500
GE 201. Philco 39-25
Motorola 61X13. Philco 46-420 Crosley 52TQ
Philco 37-116. Philco 70
AK 35 Philco 46-350
Philco 620B. Zenith Transoceanic B-600
Philco 60B. Majestic 50
Philco 52-944. AK 84
(This post was last modified: 02-16-2023, 04:27 PM by 462ron.)
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462ron - by 462ron - 02-16-2023, 04:25 PM
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