Quote:
Originally Posted by Refugee
Surely there id no bias to the base.
Check the coil and 20K resistor in the base of that transistor.
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I think we may both be wrong. The AGC voltage provides the bias to both Q3 and Q4 but Q3 has a potential divider making it's emitter less -ve than Q4 and that explains why Vbe Q4 looks better. My next guess would be the 2uF AGC capacitor is leaking but quite a few other faults could cause the AGC line to be less -ve (I hate PNP and their upside down power rails).