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In Reply to: RE: Who makes a headphone SET amp? posted by aarocks on September 01, 2016 at 05:52:59
There is some confusion of nomenclature because pentodes (and beam tetrodes) can be wired as triodes and will behave as such. There is no universal agreement on whether such amps are called SETs or SEPs.
Single-ended is in contrast to push-pull; almost all amps are either one or the other.
Triodes (and triode-wired pentodes) have a low output impedance and thus do not need negative feedback. Most but not all SETs are zero-feedback. Some triodes are directly-heated, and some are indirectly heated. This aspect is also not clear; sometimes the term SEDHT is used, but again not universally.
I am part of the Bottlehead team, so I can't volunteer information on specific products here, but I think it's OK for me to say we do offer SET headphone amps.
Follow Ups:
I can volunteer: the Crack/Speedball amp on Senn HD800s is wondrous.
WW
"A man need merely light the filaments of his receiving set and the world's greatest artists will perform for him." Alfred N. Goldsmith, RCA, 1922
If you have an SET for speakers, just make a voltage divider to attenuate. With 2 series resistors and 2 parallel resistors you can let the amp see the impedance it likes and let headphones look back to the impedance they like, and get the exact volume range you want on your preamp. And, if it's a high quality SET, you'll get better sound than any headphone amp I have heard. Just a few dollars outlay for resistors.This way, you have a vast array of SETs to choose from, or you may already have the perfect SET for this use.
Edits: 09/27/16 09/30/16
Which of the Bottlehead amps are SET? Do you guys sell them assembled?
Paul can't discuss this here. He's affiliated with the vendor. Why don't you go to the Bottlehead site and review their products?
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