Selecting replacement caps

[wx3k]

I need to recap a receiver I have. It has a electrolytic can, 30/10/10 450v.......Of course finding an exact replacement is impossible. I was thinking of ordering a standard 3 section that is 30/30/30 at 525v.....Would this be a close choice ? Or would a 20/20/20 be better with a 10 uf cap paralleling one 20uf section be a better choice ?

[wx3k]

  No answers yet ? Is this an embarrassing question ? 

[KL7OF]

I have used higher value (MF) caps in  filter applications with no ill effects...That 30/30/30/ at 525 volts would be my choice...good luck .....Steve

[WB2YGF]

How 'bout 20/10/10/10 µF @ 450 VDC and paralleling a 20 & a 10?

CAPACITOR, ELECTROLYTIC, 20/10/10/10 µF @ 450 VDC



From:

http://www.tubesandmore.com/

C-EC20-10-10-10

4 section electrolytic capacitor, used in Dynaco PAM-1 preamplifiers.

1-3/8" diameter x 2" tall
-10% to 50% tolerance

Three 10 µF sections, rated at 450 VDC, and one 20 µF section, also rated 450 VDC.

This is not a standard design of FP cap as the 20 mfd is B(lank). Standard rolling would be D(iamond) as the high cap section. 

[wx3k]

Good idea 

How 'bout 20/10/10/10 µF @ 450 VDC and paralleling a 20 & a 10?

CAPACITOR, ELECTROLYTIC, 20/10/10/10 µF @ 450 VDC



From:

http://www.tubesandmore.com/

C-EC20-10-10-10

4 section electrolytic capacitor, used in Dynaco PAM-1 preamplifiers.

1-3/8" diameter x 2" tall
-10% to 50% tolerance

Three 10 µF sections, rated at 450 VDC, and one 20 µF section, also rated 450 VDC.

This is not a standard design of FP cap as the 20 mfd is B(lank). Standard rolling would be D(iamond) as the high cap section. 

[w3jn]

Or you can rebuild the can using discrete components. 

Circumcise the can using a moto-tool with a cutoff wheel; the least noticible place is at the base of the crimp.  Pull out the guts, install new caps (hopefully the ones you've bought will fit in the old can), make sure the leads are insulated so they don't short to each other and/or the can, and glue back together with JB Weld.

[wx3k]

Cute pic of your pooch ! lol

This is another idea. Is there any toxic chemical considerations when dealing with the innards of a cap ? I think I found a "NEW" can of exact dimensions and value at Antique Electronics Supply.

Or you can rebuild the can using discrete components. 

Circumcise the can using a moto-tool with a cutoff wheel; the least noticible place is at the base of the crimp.  Pull out the guts, install new caps (hopefully the ones you've bought will fit in the old can), make sure the leads are insulated so they don't short to each other and/or the can, and glue back together with JB Weld.

[WB2YGF]

Is there any toxic chemical considerations when dealing with the innards of a cap ?

Just pretend it's 1965 when we didn't worry about that stuff.

[W1EUJ]

Yes - do not take internally. That's all. Now shut yer yap and yank the guts out of that cap!

I use a pipe cutter, it is clean if done right, and the groove it pushes in leaves space for a fillet of JB Weld, hot glue, etc.

[ab3al]

dont you dare.... im calling the epa