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In Reply to: RE: " Maybe I should be looking for a toroidal transformer" posted by Triode_Kingdom on June 13, 2017 at 19:14:02
yes I have. wound in that manner and as you say the leakage inductance goes up which means regulation goes down. I was actually rather surprised on how much of a difference the pri-sec proximity effected both the output voltage and regulation at line voltages and I was using *gasp* Stamped M6 Laminations so I did have the cross grain issue which may have made things a bit worse. Of course this is a function of all transformers so anything you do to reduce winding to winding capacitance increases leakage so you just have to pick your poison so to speak.
Along the line of the toroids... Antek has a 50VA unit that will fit your needs for $28 and the single secondary winding will be fine for your bridge. I dropped a note to John @ antek about doing a 50VA version with dual secondaries for FWCT use to match his 100VA and 200VA units which are just too big for linestage / phono use.
dave
Follow Ups:
"Antek has a 50VA unit that will fit your needs for $28"
Antek has several products that would work for this, including the 160V AS-05T160. I just wish these weren't made in China. Even Hammond is doing that now for some of their line. I'm having to source more and more NOS to be sure of getting Western-made components.
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Buy Chinese. Bury freedom.
I have a few of those Hammonds (single primary version) and the secondary has a higher resistance than the primary, about 10%. I would guess that they're designed with about 10% step-up (about 132V unloaded) to give 120V output at the rated 0.25A load. In reverse, the voltage would be 10% low unloaded, dropping another 10% at full load. These could be used in the usual direction with a voltage doubler - that's how I expect to use them.
I used a 1:1 toroid to power a small amp (w/ voltage doubler), and wound an additional 6V secondary on it for heaters.
nada aqui
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Buy Chinese. Bury freedom.
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