restoring the caps...

[J. Forster]

If you carefully re-form caps, both paper and electrolytic, they very often come
up fine. You must raise the vooltages slowly.

I have never seen a resistor that is really bad, unless someone has applied HV
quickly and blown it.

I have brought up several No 19 MK III sets and they are entirely original and
work very well. One is on the air every week.

IMO, it's at least worth a try before gutting things out, which IMO, utterly
destroys a piece of vintage gear.

John

Chris Gill wrote:

> Hi to Avery, Russ and All,
> The PC power supplies are switch-mode type and as such rectify the incoming
> mains through a bridge rectifier and may have 1 or 2 (used in series) HV
> caps, usually in the region of 150-400mfd at 350-450 volts for the filter
> cap, The high value of capacitance may not be suitable for some tube
> rectifiers though. Computer monitors also use a S.M.P.S. and as such are
> also a good source of high voltage caps, also you will find in a lot of them
> an inrush current surge suppressor which is useful for inserting in the
> "live" side of your AC supply in tube radios and test gear.
> On the post by Russ, my main interest is not only the collecting of old
> radios, but I also like to have a working unit too, so like Russ, I "gut
> out" the large can electrolytic and also the "bathtub" type paper caps found
> in some equipment and replace the internals. That way I can keep the
> "original" appearance but have a good working unit, ... Now if only I could
> find a way to reproduce those
> 40's to 60's carbon resistors!!!
> Chris,
> Cairns, Australia.
>
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