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In Reply to: RE: lundahl par-pp output transformers your thoughts? posted by used-hifi on January 21, 2017 at 10:08:08
Push pull OPTs have a small gap to allow for current imbalance. On EI cores, it also allows for the winding imbalance that is inherent to the way they are made.
The gapless ones are for places where you can guarantee no current, or at least no imbalance - such as parafeed. The small gap will actually linearize them a bit, and will make them usable for other applications. So if these are for experimentation I would get the standard version.
The LL1620's are probably what you want. At 300H of primary inductance, they will be fine for parafeed duty.
Follow Ups:
This is why I am going around and round here not figuring out what exactly I need to play down there with some power 20cycle range
ll1620's are bandwidth limited on the top end.
I am more looking into ll1679-pp much better bandwith and if you order without gap the lowest freq drops an octave!
your thoughts ???
To achieve many henries of inductance requires lots of turns of wire which increases interwinding capacitance which tends to hinder top end bandwidth.JH
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