[time-nuts] HP 5328 PSU nightmare...

[J. Forster]

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.

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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