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Re: [Amps] AL-1200 Problem

To: "Donald Knight" <>, <>
Subject: Re: [Amps] AL-1200 Problem
From: "jeremy-ca" <>
Date: Mon, 17 Mar 2008 08:27:57 -0400
List-post: <">>
Replace the "safety" diode on the PS board that goes from B- to ground. It 
is a 1N5408.

Whats with 10M lately? Youre the 4 th guy this weekend to have amp troubles 
from tuning up on 10M.


----- Original Message ----- 
From: "Donald Knight" <>
To: <>
Sent: Sunday, March 16, 2008 12:01 PM
Subject: [Amps] AL-1200 Problem

> Hello Guys,
> I was loading my AL-1200 up on 10 meters last night and all at once it 
> made a strange noise and the grid current meter went to 0. The amp was 
> still making full power out even after this happened. I've checked the 
> zener diodes and they are good. Also checked the grid resistors on the 
> meter board and they also check good. What I'm seeing now when I turn on 
> the amp is it's pulling idle plate current and the grid meter pins 
> negative just sitting there turned on and not even keyed up. It shows the 
> correct 40ma in the cw position and 150ma in the ssb position but the amp 
> is not even keyed up! Could someone please tell me what this might be and 
> where to start checking for the problem? I did pull the tube out and turn 
> the amp on and everything shows normal on the meters,correct high voltage 
> and no plate current. Grid meter stays on 0.
> Thanks,Don Knight
> n4dek
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