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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