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In Reply to: RE: I get no music out of mynewly built amp posted by DAK on October 19, 2016 at 14:36:10
"Significantly, when i touch the input grid of the 6j5 with my DMM probe there is no sound. nothing, no click, hum, or buzz. zip, zilch, nada."
That's really strange.
I assume you bias supply is referenced to ground.
I think you said the grid to bias pot resistor is only 13k?
This is not an answer to why you are getting no sound but why such a low value grid resistor?
There has to be something mis-wired.
Do you get anything using you meter at the output tube grid?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
bias supply is referenced to ground via 5.6k resistor
grid supply resistor of 6550 is 51k
When measuring the volts on power tube input grid (about -30vdc) there is definite tick when contact is made. That would indicate that the output tube stage is ok
What is the value of the cathode resistor for the 6j5 and what is the cathode voltage?Did you check/change the coupling cap? It might be open.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 10/20/16 10/20/16
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