[ARC5] An "Extra Class" Question:

[J. Forster]

BTW, I think MOVs have a sharper 'knee' than WW II Thyrites, so will cdlip
harder.

FWIW,

-John

=================


> I have really messed this thread up!
> You got it exactly right, Mike.
>
> Sorry, guys.  I was intending to get fresh insights on
> a problem, so was intentionally vague, but that didn't
> work-out so well.  Please let me explain.
>
> I meant "Extra Class Question" in the sense of it
> being the sort of question one might see on the test,
> not that it actually was.
>
> Here's the situation:  the AN/ARC-5 MD-7 modulator
> has a G.E. "Thyristor" across the secondary which damps
> modulation excursions over 300 V RMS.
> I'm rebuilding an MD-7 for a friend which had a blown
> mod. transformer.  It was blown because yet another
> doofuss decided to whack it out of the modulator,
> break off the mounts for it and doubtless try to modulate
> his pair of  P-P 813s with it.
> I've got the modulator restored and worked except that
> the "Thyristor" and its mounts are missing.
> It was dumb luck that I found a replacement
> modulation transformer and finding another is unlikely,
> should this one blow from not having the device installed.
>
> At the moment, I have two series-connect 200 V MOVs
> across the secondary.
> This is unsatisfactory because that's 400 Volts, not 300.
> Are MOVs rated RMS or Peak anyways?
> I probably knew 20 years ago.....
> And can you series them?  Like a 200 and a 100?
>
> Whatcha think?
>
>
>
>
>
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