[Amps] MLA-2500 problem

Jim W7RY w7ry at centurytel.net
Fri Aug 22 15:51:50 EDT 2014


Bad filter caps. They were going bad 20 years ago!  Metering resistors? 
(un-likely).

73
Jim W7RY


-----Original Message----- 
From: BILL KENNAMER
Sent: Wednesday, August 20, 2014 4:02 PM
To: amps at contesting.com
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
_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps 



More information about the Amps mailing list