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Re: [Amps] L4 power supply problem?

To: Jason Buchanan <jsb@digistar.com>, amps@contesting.com (Amps)
Subject: Re: [Amps] L4 power supply problem?
From: jkearman@att.net (Jim Kearman)
Date: Mon, 14 Nov 2005 13:41:16 +0000
List-post: <mailto:amps@contesting.com>
> Got to find some filter caps, diodes and possibly some new bleeders.

I used CDE 381LX electrolytics. Rated at 105 deg C, high-ripple, small. I 
recapped an SB-230 by making a Lucite plate to go over the holes where the 
originals were mounted, boring holes in it, and epoxying the caps in place. I 
probably could have epoxied them to the original phenolic plates if I wanted to 
cut out the old caps. The 450-V 381LQ caps are 30-35 mm diam, length varies 
from 40-50 mm for common values. They run about $8-12 apiece from Mouser. You 
could save a little money by using 381LQs, which are smaller but not rated for 
the same longevity. 

For diodes, I would use 1N4058, 3-amp, 1kPIV, about 17 cents apiece from 
Mouser. WW resistors aren't expensive, either. The Ohmite 20-series 7-watt 
vitreous-enamel-coated wirewounds will handle 450 V. 1.25-inches long, 0.4-inch 
diameter.

Be glad your failure didn't take out the power transformer, which is what 
happened to my SB-230. Then again, rebuilding the supply got me thinking about 
building a fatter amp that covered 160. 

73,

Jim, KR1S
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