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Advice on setting bias...

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monkeypuzzle View Drop Down
Young Croc
Young Croc


Joined: 25 January 2005
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Post Options Post Options   Thanks (0) Thanks(0)   Quote monkeypuzzle Quote  Post ReplyReply Direct Link To This Post Posted: 05 October 2020 at 12:13pm
Hi all, I've been picking away at another one of these and I keep going around in circles... I'm getting 0.68v across R6 (the resistor that sets the bias for the VAS?) which seems fine? When I measure across Q6 (the VAS) I get pretty well 0v. Across the constant current source of Q4 and Q5 I get 103v which is pretty well the full rail voltage.

I've fully disconnected the VAS from the rest by popping out R161, D4 and Q10. I've replace Q4, Q5 and Q6 and I'm still getting the same... 

What is the thing thats staring me in the face that I just can't see....?

Any help greatly appreciated.

Cheers, Matt.
blah blah blah blah blah......
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