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In Reply to: RE: PING to Audio Note Kit One owners posted by beto1 on May 05, 2015 at 15:29:53
Another question. When you say: "All DC Voltage taken in respect to ground." Are you measuring to the chassis or to the signal ground?
Follow Ups:
Hello Steve,
thanks for answer.
There is a pin on the chassis at the confluence of the grounds (green wires) of the PSU board and the connection to the mains.
Regards,
Beto
Sounds like an oscillation. JH
Hello Hennfarm,
thanks for answering. Please, can you elaborate a bit more the idea?
Regards,
Beto
Well, you first mention addressing motorboating, and it sounds as though what ever you did to "fix" the motorboating just shifted the oscillation up in frequency. I have placed dmm leads on the plate of an oscillating tube and read higher vdc than what I previously measured. My guess is that something in your amp is squealing in the kHz. JH
Hello Hennfarm,
the motorboating noise only was perceptible when I played music with very low frequencies. I put some rubber stripes bellow the transformers, between them and the chassis, but yes, maybe the problem still is there....and what I'm done was only absorb that vibrations..But one thing to clarify, when I done this, the voltage was right. The higher voltage problem begins with the short circuit I made accidentally when I was moving a wire to reduce a hum, just before to conclude the repairing work. The whole story is that I was using a new pair of glasses , with a progressive dioptric correction (I had never used before that kind), so for a second I went "blind" when I was accommodating those wires, then I touched "something" on the filament board with a screw driver ( What can I say, I'm getting older).
I will take a look to this oscillation probability as soon I can reduce the short circuit.
Best regards,
Beto
Why is the (+) and (-) of C2 wired together?
Thanks!
Hello,
they are not wired together, is just the view of the picture. C2(+) is connected to C1(-)
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