[Johnson] recapping

[radioman]

for any electrolytic.. use modern Japanese capacitors of the same or
higher voltage rating... NTE, Nichicon, are just a couple of names.  You
wont find any bad ones.

Electrolyitics are now 10 percent of the size of the originals..and more
reliable.. and closer tolerance, so just tuck them under the chassis..
and leave the old one for looks on top of the chassis.

if you dont know the voltage rating... you can usually use these:

audio cathode bypass.. 16 to 25 volt rating is usual.. higher ok but not
needed

audio screen bypass... working voltage equal to plate voltage on stage
plus 40 percent or more...  usually 450 volt units are about right for
audio, sometimes 630 volts is required.

audio coupling... double the plate voltage is wise.. usually 450 volts
is fine.
200 volts is usually not enough margin of safety., but may be ok between
first and second stage.

for audio caps... use polypropylene or other film types.
orange drops are good example
tex-caps are often found industrial surplus and are very good
plessey... same story

just don't use ceramic disc caps for audio coupling... they dont sound
good.

dont mess with the mica caps in your transmitter... unless you are
absolutley sure there is something wrong with one. sometimes a dc
blocking plate capacitor can go bad..

larry W6WUH