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Re: [Amps] MLA-2500 problem

Subject: Re: [Amps] MLA-2500 problem
From: Steve Thompson <>
Date: Fri, 22 Aug 2014 21:48:07 +0100
List-post: <">>
Don't assume that the meter reading can be trusted - don't rely on any carbon resistor in there to be the right value.


I have what I consider to be a strange problem with my MLA 2500.
First, I should mention that it has been in storage for several years, and it's
obviously over 30 years old. It shows only 800V on the meter. My first thought
is power supply, and my second thought would be old filters. But, in my past
experiences with amp power supply failures, they are usually accompanied by a
lot of smoke and noise, along with blown fuses.

The time delay does seem to work, as near as I can tell.

Anyone have any thoughts? Also, I'm thinking that if I replace the filters,
maybe an increase from 150uF to 220uF or so might help voltage stability. Any

Bill K5FUV

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