Noise in 680X and 37-690

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Noise in 680X and 37-690

Frank
Junior Member

Posts: 29
Threads: 8
Joined: Oct 2005

04-19-2006, 09:03 AM

My 37-690 is making the same kind of noise as described in the first post. There must be a common problem with these sets. My set already had the Philco modification done to it. They also replaced the candohm with a new Philco unit that contains only two sections. I went ahead and re-replaced the 300 and 75 ohm resistors that were Micamold resistors with new 5 watt resistors. Still makes that cracking sound.

There is a voltage fluctuation that occurs when this noise happens. I put a lug from my meter on to one of the primary leads of the driver transformer and saw this happen. More tracing needed, I guess....

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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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