vrs wrote:
What you are saying is consistent with what I see on
most sites selling
these things. There, "run" caps are generally oil, and "start" caps
are
generally electrolytic. The exception being the occasional "start/run" cap,
whatever that is.
The original caps in the TU56 are high capacitance, and clearly
electrolytic. But they appear to be wired for continuous phase shifting
duty. Hence some of the people on the list insisting that they are "run"
caps, and that the beefier, more expensive "run" cap should be used.
Finding a 100uf oil-filled "run" cap is not easy, and they tend to be
expensive (as Jay pointed out).
Well they are more around I think do to the vacumm tube audio field and
may want to look there.
http://www.percyaudio.com/ some nice NEW caps here. Still about $50
for 100uf.
The TU55 uses a 7uf oil capacitor in this role, which
again argues for a
"run" capacitor, except the values are wildly different. Is it possible
"start" caps were used in the TU56 to save $$, but are being derated somehow
so they can be used as "run" caps??