[Elecraft] no audio after switch on

[W3FPR - Don Wilhelm]

Karl,

Try re-soldering things - particularly U2, Q12, D1, R3, and R5.  The normal 
voltage at U2 pin 1 is 3.7 to 3.8 volts for most K2s.  A solder joint that 
looks good, but has some resistance could cause that sort of problem - and 
the resistance can change with temperature, so results are unpredictable.

73,
Don W3FPR

----- Original Message ----- 

my K2/4477 shows the same strange sffect. I found out: AGC goes up, blocking 
the IF-Amp; S-Meter shows full deflection, can
be checked at the AGC-Amp U2A pin1. Touching that  IC with your fingertip 
acts like a reset. Changing the IC did not cure the
problem. I observes it mainly at switch on, but also sometimes "in between". 
Will try to find out what is going on there. Otherwise
we have Gary!