J. Forster wrote:
With tube gear, one fairly good way to reform the caps is either pull the
tubes (label where they came from) or disconnect the filament supply, and
then apply B+. You do need to check the schematic to make sure you don't
overvoltage caps that would see an increased voltage w/o plate current.
Also, cathode bypass caps may never see the reforming voltage.
Good advice, but leave the rectifiers (80, 5Y3, 5U4 etc.) in their
sockets :-)
Bill K7NOM
For solid state equipment, the light bulb thing will limit collateral
damage on simple rectifier-filter analog supplies. Switchers are more
problematic.
-John
=============
And vacuum tube equipment using indirectly-heated cathodes:
http://www.cpii.com/docs/related/23/Basic%20Tube%20Design.pdf
"Operating techniques that are proper for filamentary tubes are not
necessarily
correct for tubes with indirectly heated cathode emitters. In
particular, the opera-
tion of cathode types at reduced heater voltage can be destructive to
the tube."
Leigh.
Mark Sims wrote:
Be very careful powering up modern equipment on variacs and with light
bulbs in series, etc. You go through areas where the bias voltages, etc
are in the right place to cause serious damage. Switching supplies can
be particularly entertaining...
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