[Amps] New Amplifier Problem

[Vic Rosenthal 4X6GP/K2VCO]

An insect in the tuning capacitor? Used to fry mice regularly in the 
phaser at the AM BC station I worked at.

On 28 Mar 2015 23:41, George Allen wrote:
>
>     Hi
>
>     I  just bought a new to me amplifier (Alpha 89) that I have run into a
>     problem. I was tuning up on 75m (Into a Dummy Load) and all
>     of a sudden I could smell something burning, and at the same time I lost all
>     output power. I was still getting a grid current reading
>     of roughly 35ma, not sure of the plate current as the meter was on the tune
>     scale.
>
>     I immediately shut the amplifier off and turned off the mains. I pulled the
>     cover off and did a good visual inspection for anything
>     that looks like it has been burnt or destroyed. I could find nothing that
>     looks suspect.
>
>     I put the cover back on and turned on the mains. I turned the amp back on
>     and it went through it's 3 minute wait cycle ok with
>     no issues. I put the amp into the opr posn and gave it a bit of RF and all
>     apears to be working fine, however something went
>     wrong previously as I couldsmell something burning.
>
>     I am sure someone must have experienced this before and could point me in
>     the right direction of where I should be looking.
>
>     Thanks in advance.
>
>     73, George


-- 
73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/