[Amps] What is wrong with my Alpha?

[Vic K2VCO]

Bill and Cindy wrote:
> Maybe someone here can figure this out. I can't, Alpha service can't.
>  
> I am the original owner of an Alpha 89. In March it started soft faulting a lot.
> No red lights flashing to indicate "tune" or "swr". This usually happens on
> 15M but SOMETIMES on 20M or 40M. When the amp is tuned up with a
> tone, there is no problem getting 1500++W out, no faults. Then when the
> amp is keyed (say at 30 WPM CW) using either paddles or N1MM/laptop
> it will fault at 800-1000 W, sometimes faulting at 400W after an hour of use.

I would look at the output of all three of your transceivers on a scope 
to verify that there isn't a power spike when keyed. Some transceivers 
put out 150 watts or more for a few ms when keyed, even when the power 
is set to 50 watts.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco