[Collins] 30s-1

[Björn Magnusson]

Hi.
I have a Collins 30s-1 and I have a problem with it. 
When I start it up and wait a few minutes to get it warm the bias is correct.
But when I start to transmit the bias will slowly goes down. 
And after a half of a minute it will only come up to approx 0,1 on the multimeter. 
If I change to call mode the bias is correct. 

Do you have any idea of what the problem might be? I have checked the electrolyte capacitors that I can think Bill be wrong with but they seems tone ok. 

Thank you. 
Best regards Bjoern. 
73 de sa6axu.