[Milsurplus] Replacing/rebuilding old stud-mount caps

Barry Hauser barry at hausernet.com
Thu Jan 12 09:09:50 EST 2006


Hi gang

I have a number of old pre-war and '40's receivers that have three or four 
stud-mount filter caps.  These include Scotts and Nationals.  These are not 
electrolytics, but oil-filled paper caps with two insulated terminals and 
I'm pretty sure all of them are 4 mfd.

Modern poly's and orange drops don't go up that high, at least none I've 
seen listed.  Tops seems to be 1 or 2 mfd.  Might be a bit messy putting in 
a bunch of them in parallel.

Anyone know of a good replacement technique?  Would you up the capacitance? 
Go with electrolytics?

If they test good, I'm inclined to leave them alone, but I dunno.  I do have 
one or two cases where the caps are broken.  They have phenolic or bakelite 
insulators between the can and the threaded mount which is a weak point if 
they get rapped -- unlike regular, single terminal stud mount cans where the 
can and mounting threads are all metal and solid.

Barry



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