Noise in 680X and 37-690

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Noise in 680X and 37-690

Ron Ramirez
Silent Key

Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand State, Province, Country: Indiana

#14

05-22-2012, 07:01 PM

Ditto what Arran said. I hope you still have the "bad" tweeter, original Philco tweeters are pretty much unobtainium.

Now, if by "tubs" you mean "bakelite block capacitors," there is one under the main (upper) chassis that is not a capacitor - it contains the coils for the set's 10 kc audio filter! Never, ever open this bakelite block up!

The 37-690 sets have some residual hum thanks to the directly heated filaments used in the 6B4G output tubes, but the 38-690 should not have much hum at all, if any, since the 1938 version used 6L6G outputs with indirectly heated cathodes.

--
Ron Ramirez
Ferdinand IN

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Messages In This Thread

Noise in 680X and 37-690 - by Fred R - 12-28-2005, 10:23 PM

RE: Noise in 680X and 37-690 - by Sam samuelian - 05-22-2012, 05:42 AM

RE: Noise in 680X and 37-690 - by Arran - 05-22-2012, 06:51 PM

RE: Noise in 680X and 37-690 - by Ron Ramirez - 05-22-2012, 07:01 PM

RE: Noise in 680X and 37-690 - by Sam samuelian - 05-22-2012, 10:25 PM

RE: Noise in 680X and 37-690 - by morzh - 05-23-2012, 10:06 AM

RE: Noise in 680X and 37-690 - by Ron Ramirez - 12-30-2005, 12:37 AM

[No subject] - by Fred R - 12-30-2005, 10:41 AM

[No subject] - by Ron Ramirez - 12-30-2005, 11:30 AM

[No subject] - by Chuck Schwark - 12-30-2005, 12:00 PM

[No subject] - by Frank - 04-13-2006, 10:17 AM

Noise in output - by AI2V - 04-15-2006, 09:27 AM

[No subject] - by Ron Ramirez - 04-16-2006, 10:06 PM

[No subject] - by Frank - 04-19-2006, 09:03 AM

[No subject] - by Frank - 04-24-2006, 08:55 AM

[No subject] - by Frank - 04-25-2006, 08:41 AM

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