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Re: [Amps] issue with AL-1200 output

Subject: Re: [Amps] issue with AL-1200 output
From: Steve Bookout <>
Date: Fri, 23 Jun 2017 21:38:05 -0400
List-post: <>
Hello all,

Jim is right I didn't mention what band. I guess I was biased toward it being the output relay.

It was on 15 meters so I would not expect there to be any padder caps there.

Have been getting ready for field day today, so didn't mess with it.

First thing I'll do when I open it up is to solder across the output relay.

73 de Steve, NR4M

Date: Fri, 23 Jun 2017 06:09:22 -0400
Subject: Re: [Amps] issue with AL-1200 output

<Steve, this sounds like an output padder C that has lost ESR and heats up
<with power applied. Heat will cause the capacitance to change. Many
<amplifiers  use large value capacitors which are known to develop this problem 
<time. If this is the problem, lowering the power output will take longer to
<see  the power drop.
<Gerald K5GW

##  He did not say what band he tested on.   Any loading cap padder would be on 
the 160 + 80m bands.
He might want to re-run the tests  on 40 + 20m..... if its fine on  40-10m, 
then its 99 % likely to be a padder
on the lower bands.

Jim   VE7RF

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