Quote:
Originally Posted by kalee20
Thanks, Argus! (It's not actually a case of 'more turns is always better' because as turns increases, winding self-capacitance also increases so as low-frequency bass response improves, high-frequency response drops off.
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Yes generally true, however there are two things significantly helping in this particular case. The rewind will not have paper between the layers and all other things being equal, the secondary's inter-winding capacitance with its jumble wind will be lower than the original winding's capacitance. Although the original might have been jumble wound, but in any case it is much less of a problem with an auto-transformer than an isolating transformer design with the same ratios as the total turns numbers for the same transformation ratios are less.
Generally the upper audio frequency response only starts to get troublesome due to secondary capacitance for valve radio work with 1:5 isolation inter-stage transformers, which is probably why this was about the highest ratios that most manufacturers pushed it to, or maybe 1:6.
So since this particular transformer also is fairly small in size, it probably would do well with some more turns most likely, within sensible limits, certainly no less than the original.