Hi all,
I'm very new to tube gear and wondered if someone would explain to me
differences in the physical size of electrolytic caps? By this I mean
that, in having to change a couple of caps in an amp, lets say 2200uF at
450V, I could get one that was about 20mm x 50mm...but there were others,
one in particular a RIFA cap that was 70mm x 120mm. Does the physical size
of a cap make any difference to its operation?

In article opscs14twep4wifg@robert, terry donald
wrote:

I'm very new to tube gear and wondered if someone would explain to me
differences in the physical size of electrolytic caps? By this I mean
that, in having to change a couple of caps in an amp, lets say 2200uF at
450V, I could get one that was about 20mm x 50mm...but there were others,
one in particular a RIFA cap that was 70mm x 120mm. Does the physical size
of a cap make any difference to its operation?

Size does not matter in this case. Over the years, the materials
used to build caps has gotten better, and as a result, caps have
gotten smaller. What is critical is that the voltage rating is
maintained. If you need a 450V cap, replace it with at least a
450V cap. Capacity rating is not too critical on large electrolytic
caps. Being -10% and +100% is normally pretty acceptable for a
replacement value. The values stamped on these things are pretty
nominal anyway--the real value can vary quite a bit.

-john-

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John A. Weeks III 952-432-2708
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