[Elecraft] Power Supplies
Edward R. Cole
kl7uw at acsalaska.net
Sun May 6 21:06:20 EDT 2012
I guess in any case "your experience may vary", but here is mine.
I have an Astron VS-35M that was bought in 1980 and only repaired
once when I back biased the LM923 by charging a battery, Pass
transistors are the originals. That is 32-years of service! It now
serves as my service bench supply, because I replaced it with a
RS-50M which runs 24/7 for at least 10-years.
I had dozens (35 to memory) of the R20A at work that served very
reliably in severe maritime environments on boats and kept on
working. I did have one or two croak but they were in-service
continuously on the boats (24/7). Those that went I suspect from
boat generator voltage surges (to 160vac). The transformers failed.
The Astron's are very basic design and completely reparable if the
transformer is OK. I did even order a replacement for the
transformer that cost > 50% the new price on the PS. IN my final
years on the job I ordered some of the 20A switching supplies for
their size/weight to package into portable packages.
73, Ed - KL7UW, WD2XSH/45
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BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-?
DUBUS Magazine USA Rep dubususa at gmail.com
"Kits made by KL7UW" http://www.kl7uw.com/kits.htm
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