Tim,
Yes, if you're using an NST, then it's best to use LTR to keep the
voltage lower to prevent destruction of the NST from over-volting,
especially
if you're running with a synch rotary (Or an async rotary for that matter,
however an NST with LTR probably won't work that well with async. Async
is best STR operation probably). The same would apply for OBIT type
transformers. If you're using a static gap, you can limit the voltage by
keeping
the gap narrow, but LTR probably gives better performance anyway overall.
If you're using a pole transformer or other type of robust transformer
then you can probably get away with using LTR, but usually these
larger transformers are run STR. Yet by the time the ballast is
adjusted and tuned, it may actually be running resonant anyway.
Resonant or not depends a lot on how you define it with these transformers
which are not inherently current-limited.
Cheers,
John
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