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Re: [Amps] New Amplifier Problem

Subject: Re: [Amps] New Amplifier Problem
From: Vic Rosenthal 4X6GP/K2VCO <>
Date: Mon, 30 Mar 2015 10:56:46 +0300
List-post: <">>
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:


    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

    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

Vic, 4X6GP/K2VCO
Rehovot, Israel
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