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Re: Just wonderin' (fwd)
Chris,
If they were my NST's I wouldn't run them in parallel. I think the
reason you are not getting a definitive answer, is the fact that the two
NST's are close in value. I haven't tried it, so this is only a guess.
At best case, the higher voltage transformer will pump voltage into the
lower one causing it to approach its current limit point faster, and
generating heat. You won't have the benefit of twice the current at 12
KV. (but they probably wouldn't self self-destruct immediately; no
telling what happens when a spike comes back down the line from the TC)
The ARRL handbook of days gone by, showed a method of using two
mismatched transformers. It doesn't seem to be in the more recent
editions.
They took a third transformer, and used the center-tapped secondary, to
balance the output of the transformers. The third transformer had a
secondary voltage rating of ~10% of the transformers to be matched. The
current rating was equal or above. Each of the (mismatched)
transformers was fed into one half of the matching inductor
(center-tapped xformer) and the output was taken from the center tap.
With CT grounded NST's that probably means two matching inductors on
each sets of outputs. (and if you really try it . . . remember that the
insulation on the matching inductor won't be sufficient to prevent an
arc to the core, so the whole transformer will have to be insulated
above ground).
And "AAARRRGGGHHHH!" would be geek for what?
take care
bob
> AAARRRGGGHHHH!
> Alright....now we've come full circle. Can't someone just tell me
> with any degree of certainty wheather or not I can paralell these
> things? I would like to pair the 12KV 30 to the 15KV 30 ...that
> should be okay, the 12 sould be able to handle the higher voltage.
> I also have a 7.5KV at 100mA that would rock but I'll probably let
> the magic smoke out if I try to put 12 or 15 KV through it.