20 Jul
2015
20 Jul
'15
6:05 p.m.
On Jul 20, 2015, at 18:02 , Tothwolf <tothwolf at
concentric.net> wrote:
I replace wax paper types with polyester (mylar), polystyrene or ceramic discs, depending
on how they are used in the circuit (note however that for wound foil types, modern
replacement parts do not mark the outside foil, which needs to be at ground potential in
many tube circuits, otherwise the circuit can pick up noise and hum).
Funny that you mentioned that! I just watched a YouTube video today about how to
experimentally determine which lead is connected to the outer foil for applications where
that's important. Modern film caps may have a stripe on one end, but it doesn't
appear to reliably indicate which lead goes to the outer foil.
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/