[SCCC] Capacitors - Caveat Emptor
k6xt at arrl.net
Wed Jul 28 17:22:35 PDT 2010
Mouser just delivered me some 500V 240uF screw terminal electrolytics
for my Alpha 76PA. Your first question will be "why 500V?". Because it
uses a Peter Dahl 3CX800 transformer running about 2800V no load. Which
also enumerates why I needed new capacitors. The six 450V units took the
abuse for three or four years before spitting their guts on the PC board.
So what is this. 500V caps of this configuration are apparently not used
much. Several suppliers list them, none of which except Mouser had any
in stock. Mouser had 5. Number 6 took 6 months for Mouser to get and
send to me.
What gets me ornery about it is this. For the entire 6 months C-D had 5
units on a shelf in South Carolina. Could I interest anyone, cost be
damned, in snagging one of these for me? Will C-D sell direct to me at
any price? Despite numerous pleas, not a chance.
The moral of my sad tale is this: If you plan (hi!) to blow up your
similarly situated amp, plan ahead ordering those caps!
Yep. I could have hacked the ckt board to haywire in a seventh 450V.
Chose not to. Instead I bought a spare amp so I'd have a spare in the
event and also so I'd have an instant on. That three minutes has always
been a DX'ers bother.
"Whether you believe you can do a thing or
not, you are right." --Henry Ford.
More information about the SCCC