Subj : Re: Powering up 28s and 64s that have been in storage for at least a de
To   : Computer Nerd Kev
From : Computer Nerd Kev
Date : Fri Apr 29 2022 12:15 pm

Computer Nerd Kev <[email protected]> wrote:
> Kenzo <[email protected]> wrote:
>>
>> For the 128 and 64 computers, should I power them up with low
>> voltage on a variac for a while before giving them the full 120v?
>> The idea being to perhaps give the old caps a better chance of
>> surviving powerup after long storage?
>>
>> Or would low voltage give the power supplies and internals problems?
>
> It should be OK so long as you don't connect any externally-powered
> accessories such as a disk drive when they're under test, in which
> case the voltage difference between the different devices could
> cause damage in various ways.
>
> Usually that technique is used with equipment with higher internal
> voltages though, I'm not sure whether it will prevent much in this
> case where the difference is only a handful of volts.

Actually the extra ripple resulting from the voltage from the
transformer being under the value of the voltage regulator could
possibly be a problem with the electronics in the computers due
to capacitors causing different voltages to exist in different
places.

Probably best not to use the variac when powering the computers,
and if using it at all then just for the PSUs connected to a dummy
load (high-wattage resistors).

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