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I can't lie. I like to listen through headphones. Also, it sometimes simply is a necessity (late night listening session with the wife asleep in the next room).
So: are there any dedicated DIY tube headphone amps?
Thanks, epador
Follow Ups:
Headphones are underappreciated, mostly because they are usually driven with crap and thus sound like crap.However....when you think about it, a 97db/mw neodymium magnet full range driver that goes 17hz-25khz, for only $150 a pair, at 300 ohms so you can drive it with ease with an OTL, that doesn't bother the neighbors and doesn't take up any living room space, should be every tubehead's wet dream.
It's not hard to design your own headphone amp. How about a 417A single-tube amp? Or something based on a 71A run at a sleepy 90V? I'm chewing over a direct-coupled OTL PP amp right now. Or how about a 47 Labs-ish approach to an OPA134 amp using 9V batteries for power? How about a single-ended direct-coupled OTL using the 6AS7? Or a Circlotron built with 6N1Ps? Go nuts.
Hi all.WAD do a tube headphone amp - suppose to be very good design by what people say, URL included (scroll down until you see a unit called HD83 headphone amp).
Cheers,
Guy.
Is the way the C4/C7 "bypass" caps are connected in
http://www.worldaudiodesign.co.uk/pdf/hd83crt.pdf
some new circuit I don't know or just a plain mistake?natko.
I see what you mean Peter. Still, I find it rather strange. C4/C7 are dimensioned like classical bypass caps. The DC path to GND through the OT is not bypassed though.
And why would you route that 1mA DC through the OT helping saturate the core?
This is a strange circuit indeed.natko.
Strange? Well, it is different but I think I've done stranger things. If you get a chance read the circuit description:
http://www.worldaudiodesign.co.uk/products/hd83crttext.html
to get a little more insight as to why they did it that way.BTW I haven't heard it so I can't comment as to the sound but I must admit that I like the safety aspects of an OT coupled headphone amp.
Pete.
The DC path for the cathode is through the 1K and the feedback winding. If you assume about 22 ohms for the winding then the 0.88mA plate current and cathode current match. The RC form part of the AC feedback path.My 2 cents.
Pete.
I've designed a few...One design is posted on my web page. Feel free to ask if you have any questions about headphone amps.
Pete
You can also check out my project at the link bellow.
http://home.jps.net/~jenya/hifi/headphone_amps.htm
You'll like this for a start:http://headwize.com/
Hasta...
You guys are the best! Great info. epador
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