Advice on setting bias... |
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monkeypuzzle
Young Croc Joined: 25 January 2005 Status: Offline Points: 923 |
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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.
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