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If you are looking for a OTL headphone amp that can drive both high and low impedance headphones, consider the Kludge OTL 4 headphone amp. The write up and circuit can be found in the old Vacuum Tube Valley Issue 11 starting on page 24.
If you are handy with a soldering iron, you can make it yourself. I got the iron from Heyboer, who makes excellent iron.
This amp performance really depends on the tubes selected. With high quality NOS tubes, such as a RCA 5691 red base, and a Bendix/Tung Sol 6080, the amp sounds very good, and easily competes with much more expensive headphone amps.
" Don't look back. Someone may be gaining on you"
Sctchel Paige
I have a Bottlehead Crack OTL amp that I used with 600Ohm phones. It was a good combo until I got my first pair of STAX. They blew the electrodynamic phones & amp entirely away.
"'Cause when love is gone, there's always justice./And when justice is gone, there's always force./And when force is gone, there's always Mom. Hi Mom!" Laurie Anderson, "O Superman (For Massenet)"
Very nice. The setup I'm using now, with Ultrasone Edition 15, Chord Hugo TT, and the Kludge Headphone amp, is every bit as good or better, IMHO.
" Don't look back. Something may be gaining on you"
Satchel Paige
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