[Amps] MLA-2500 problem

[Carl]

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.

Carl
KM1H


----- Original Message ----- 
From: "Alek Petkovic" <vk6apk at bigpond.com>
Cc: <amps at contesting.com>
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
> VK6APK
>
> 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
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>
> -- 
> From sunny Binningup, Western Australia.
>
> Family Businesses:
> Petkovic Air&  Gas. petkovicag at bigpond.com
> SP Electrical. www.spelectrical.net.au
> Hampers by Hand. www.facebook.com/hampersbyhand
>
> http://www.qrz.com/db/vk6apk
> http://www.qrz.com/db/vk6ap
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2014.0.4716 / Virus Database: 4007/8081 - Release Date: 08/22/14
>