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Re: [Amps] MLA-2500 problem

To: "BILL KENNAMER" <>, <>
Subject: Re: [Amps] MLA-2500 problem
From: "Carl" <>
Date: Fri, 22 Aug 2014 15:33:52 -0400
List-post: <">>
Replace the filter and relay PS caps plus the HV multiplier resistors.

Then you can test the amp with the tubes removed at first.
The next step is some improvements as well as seeing what hacks were done....such as bypassing the input load resistor which is a great way to get 1500W and a soon dead set of tubes.


----- Original Message ----- From: "BILL KENNAMER" <>
To: <>
Sent: Wednesday, August 20, 2014 7:02 PM
Subject: [Amps] MLA-2500 problem

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 suggestions?

Bill K5FUV
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