There was a flood of 50v 50a switching supplies from commercial
servers on the market a while back, they were pretty cheap.
A bunch of Hams reported using them and found them to be rfi-
clean, but I could not find anyone who had really checked them
out carefully and recorded the results.
Perhaps you might still find one.
73, doc KD4E
> I am having to replace a 50V 20 amp Ameritron unregulated supply with
> something better regulated. I got a fairly cheap 48 V 22 amp switcher --
> but knowing what they're like, I also "won" "buy it now" a lab bench 25 Amp
> 50V lab PS that due to age is almost certainly linear -- and it weighs 80
> lbs. That's still no guarantee; some of the Sorenson's were SCR regulated
> on the front end, for all they weren't switchers, and those are noisy.
>
> FWIW, Ameritron sells a purpose-built 50V switcher for its ALS-600
> amplifier. For $700 .
>
> They and MFJ (who bought Ameritron) also sell a 75 Amp 13.6V supply for the
> ALS-500M amplifier. It's $360.
>
>
> Cortland
> KA5S
>
>
>> [Original Message]
>> From: Dale Svetanoff<svetanoff@earthlink.net>
>>
>>
>> ... For truly "clean" power, get a "hernia-maker" - meaning a linear power
>> supply, not a switcher. You only have to worry about 60 or 120 Hz hum and
>> ripple with those. If you don't want big iron like that, then stick with
>> the select group of switchers that are designed for communications
>> applications. Those units will exceed performance of FCC Class B
> equipment
>> by controlling both the radiated and conducted emissions. Yes, you will
>> pay more, but you get what you pay for.
>>
>> If you watch closely, there are surplus equipment dealers (and people at
>> hamfests) who sell off big linear power supplies very cheaply. They were
>> the norm 20 or 30 years ago, and you can probably get one for under $50.
>> You'll want to find it locally, however, as these babies usually weigh 40
>> pounds or more when you start talking 50 amps (or greater) output
> current.
>> Unless malfunctioning, they usually deliver clean power to the loads.
>>
>> 73, Dale
>> WA9ENA
>
>
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>
--
Thanks! & 73, doc, KD4E
http://KD4E.com
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