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In Reply to: RE: Who makes good output transformers these days? posted by Iczerman on June 30, 2024 at 13:17:53
Edcor and Hammond.Last I talked to Heyboer the backlog was pretty long.
Edits: 07/05/24Follow Ups:
Hammond transformers have often been shown to exhibit higher distortion at low frequencies than other offerings in their class. Whether this is important I suppose depends on the budget.
I recall reading some articles that measured Hammond vs Edcor and possibly vs Triode Electronics and you are correct - some models of Hammond did have more distortion in the LF range.
Too bad Triode electronics is no longer producing their Dynaco Clones.
One of my many favorite posters on here, DF, has explained on a few occasions that different manufacturers will have transformers that really shine in their portfolio. (you're also a favorite TK!)
I'd bet Lundahl would be pretty safe in any impedance ratio - but I've been told more than once that it is easier to wind a transformer with a lower primary impedance - and usually 2500 ohms is what is thrown around for SE.
If I were shopping for SE transformers today I'd be looking in the 2500-3500 ohm to 6 ohm secondary. Single tap secondary - and I might pass on UL taps if I was working with triodes.
I also try to keep in mind Earl Geddes when I pick output transformers - as he's essentially said < 100hz is mostly a product of the room.
"If I were shopping for SE transformers today I'd be looking in the 2500-3500 ohm to 6 ohm secondary."
The only problem with this is the fact it isn't optimum for distortion with most of the common triodes. I've had this discussion with a few builders who are more experienced using tubes like the 300B than I am. It's pretty obvious these low-Z designs sacrifice linearity for power, but that seems to be what the market wants. Maybe an abundance of even-order distortion is one of the attractions, but I just can't bring myself to intentionally design an amplifier that way. This is why I haven't yet built a push-pull amp with triode-wired pentodes (6L6, EL34, 6V6, etc). None of the transformers I have on the shelf have a sufficiently high primary Z to do them justice.
'
Edits: 07/14/24
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