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Philco 620 tuning capacitor
462ron
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#1

01-24-2017, 07:41 PM
Just finished the chassis resto on this 620 and it plays very well. Did all the cap and bad resistor replacements and had the tuning cap off the chassis for a cleaning in an ultrasonic cleaner. Reinstalled and as I said set plays well except I noticed a dead spot around 700kc area. It was scratchy there and measured low resistance between the plates. After inspecting and not finding any touching plates I figured there was some foreign material or crud in there that I can't get to. So, what I tried and had success with was I charged an electrolytic cap to around 350 volts and clipped it across the tuning cap and when I hit the troubled area the cap discharged with a spark and cleared the problem...worked great. I figured I would pass this along!

Ron
Bendix 0626.      RCA 8BX5.   RCA T64
Philco 41-250.    Philco49-500
GE 201.             Philco 39-25
Motorola 61X13. Philco 46-42        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
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