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40-180 slight hum
morzh
Odobenus rosmarus
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Posts: 16,510
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#7

10-13-2014, 05:16 PM
In my case of Philco 20 (2 weeks ago) it was bad Ground connection in the 27 tube's socket.
Yes, rivets are often culprits.

Also bad grounding of the coil shield cans. Simple twisting motion restores it by breaking the oxide layer that has formed in all those years.
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Messages In This Thread
40-180 slight hum - by Edisla - 10-09-2014, 09:32 PM
RE: 40-180 slight hum - by KCMike - 10-09-2014, 09:57 PM
RE: 40-180 slight hum - by Edisla - 10-10-2014, 07:59 PM
RE: 40-180 slight hum - by DeckApe - 10-13-2014, 02:57 PM
RE: 40-180 slight hum - by morzh - 10-13-2014, 03:37 PM
RE: 40-180 slight hum - by mikethedruid - 10-13-2014, 04:02 PM
RE: 40-180 slight hum - by morzh - 10-13-2014, 05:16 PM



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  1. The PHILCO Phorum
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