[Elecraft] Tx distortion

[mustang65]

Hi!

I have hade my k2 about 14 years with number 4503 and it been a pleasure to
build and operate it 
but now I got problems with distorsion on the TX audio. 

It will usully work  fine when it been resting over the night but after a
while the distorsion slowly comes.
I t start with the base in the audio are reduced and then the treble are
cracking up. It sounds like you driving a audioamplifier just  alittle to
hard. 
The problem is the same with thek2/100 or when it removed from the k2.

I have used a 2 tone signalgenerator and loked with a scope att the signal
after the ne602 and after the 10w amplifier 
and it looks fine to me but the bandwith of the scope is just 15Mhz so I
might be missing something. 

I have replaced u5, Q1, D2and some capacitors on the ksb2 board, tried to
find any bad soldering but no luck.
Can it be a bad capicotor in the  ssb filter or in the Tx signal path?

Grateful for any advise.




--
Sent from: http://elecraft.365791.n2.nabble.com/