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Re: [Amps] MLA-2500 problem

To: "Alek Petkovic" <>
Subject: Re: [Amps] MLA-2500 problem
From: "Carl" <>
Date: Sat, 23 Aug 2014 12:31:12 -0400
List-post: <">>
There were several runs of the MLA-2500/2500A/2500B and some had carbon and others had 1% film resistors; the film should be fine.


----- Original Message ----- From: "Alek Petkovic" <>
Cc: <>
Sent: Friday, August 22, 2014 6:46 PM
Subject: Re: [Amps] MLA-2500 problem

R5, R6 and R7, 1 Megohm, 2 Watt, resistors, in the HV metering circuit have probably gone a bit high. Dunno if they would go so high as to give you only 800V indicated but I would check and/or change them anyway.

73, Alek

On 21/08/2014 7:02 AM, BILL KENNAMER wrote:
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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From sunny Binningup, Western Australia.

Family Businesses:
Petkovic Air&  Gas.
SP Electrical.
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