[Top] [All Lists]

Re: [Amps] Ameritron AL80B possible arcing?

To: "Jeremy Downard" <>, <>
Subject: Re: [Amps] Ameritron AL80B possible arcing?
From: <>
Date: Thu, 19 Apr 2018 07:21:54 -0400
List-post: <>
I have worked on many of these amps as well as many other amps. More than one issue will cause this, but the first one to think about is did you replace the resistors that shunt the caps that you replaced? Quite often you will find one of the shunt resistors are open. When this happens, it causes the cap that it shunts to have high voltage across it (over its voltage limits). Then the caps breaks down (that is the pop you hear), and the the cycle restarts with that voltage building up again with another pop coming soon. etc. You will have to lift one end of the resistors to check (ohm them out) them.

Hope this helps,
73, Bruce, W8HW

-----Original Message----- From: Jeremy Downard
Sent: Sunday, April 15, 2018 09:57
Subject: [Amps] Ameritron AL80B possible arcing?

I was recently given the AL80B with a known AC issue which was found to be
the power supply caps that have been replaced with new CDE caps from
Harbach.  The amp will power up and produce power but about every minute or
so the amp will produce a loud click.  It almost sounds as if someone took
a hammer and hit the case on the amp.  Could this be some kind of HV arc
somewhere in the amp?  Has anyone ever experienced this?  Or possible ideas
of what it could be?

Jeremy KD8VSQ
Amps mailing list
Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>