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In Reply to: loud squall on output transformer posted by J.A.Z. on July 23, 2002 at 17:23:08:
Sounds like your case is not grounded. A lot of times cases that are painted have the paint acting as an insulator. Scrape away some of the paint to make good connections. Test the ground resistance between the chassis ground and the circuit ground.
Follow Ups:
Chris O.
Thanks
I noticed that my AC outlet has a very poor E-GND connection.
Could this be the problem?
Juan
Try reversing the feedback as the other poster suggested - this is much more likely the problem. -jd
Gentlemen,
Thank you for the help, the problem was with the feedback.
corrected the problem and it sounds really good....
But now I have oscillation in the signal path, I was able to eliminate
most of the oscillation by adding a small amount of capacitance
between the 12au7 and the 6l6 signal path. But I still hear a small
amount from my speakers, hear is what I have noticed, If I run my hand
around the first stage (6c4) I can very the oscillation, and if I add
a shild over the 6c4 and ground it to the case, I can elliminate
the problem.
My question is where is the ocsillation coming from and how do I get rid of it without adding a shild around the 6c4, this would require that I replace the tube socket to one that accommodates a shild.
Thanks
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