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Headphone Heights Welcome to Headphone Heights, the place for all your ear bud discussion |
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In Reply to: Hafler HA-75 posted by Dawnrazor on August 8, 2019 at 19:44:45:
I would guess that what you are looking at is a low voltage, high feedback "tube harmonic distortion" tone circuit before a power IC output. I doubt there are any circuit changes on the impedance switch other than lettering. 12AX7 is mainly useful where you need a ton of gain, phono sections and guitar inputs. They have too much gain for circuits like these without massive feedback and they are pretty weak drivers.
I think what people would want in a tube headphone amp is simply a 2A3 tube amp with an output transformer with a headphone jack, but that is more than $650 from Amazon.
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Follow Ups
- I doubt David Hafler would have designed a headphone amp with a 12AX7 - Chip647 10:00:14 09/12/19 (2)
- RE: I doubt David Hafler would have designed a headphone amp with a 12AX7 - Dawnrazor 12:50:04 10/13/19 (0)
- Tubes. (Yay!) - Triode_Kingdom 17:43:37 09/20/19 (0)
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