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DIY Headphone Tube Amp using 12ax7's or 300b's

post #1 of 7
8/29/05 at 1:55pm
Thread Starter 
I've been hunting for a DIY HeadAmp that uses the popular 12ax7 or 300b tubes. Anyone help me with this search? Thanks!!
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post #2 of 7
8/29/05 at 6:06pm
In My Personal Humble Opinion, neither of those tubes would be suitable for headphone application. 300B would be overkill - both in terms of cost and power - and 12ax7 is more of a pre-amp tube rather than an amp.
Suggest you go with something like a 2a3 (still lot of power than required by a headphone). But any decent triode tube with low(er) plate impedance, operating in Class A would make a great headphone amp.
For a start just google for tube headphone amp and see what you get.
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post #3 of 7
8/29/05 at 6:17pm
look here
http://www.audiodesignguide.com/my/se1.html#MAIN

300B not suitable for OTL operation due to directly heated cathode.
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post #4 of 7
8/29/05 at 9:09pm
Quote:
Originally Posted by kevin gilmore
look here
http://www.audiodesignguide.com/my/se1.html#MAIN

300B not suitable for OTL operation due to directly heated cathode.
Sure. but you dont have to go OTL. with any valve FTMOF. A good transformer (like the lundahl mentioned) should be a very good interface between your headphones and the fire w/o compromising sound. The weakest link would still probably be the headphones.
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post #5 of 7
8/30/05 at 8:22am
These days virtually all tube amps are otl. There are only a couple
of commercially built transformer output units available.

I have nothing against transformers, they are absolutely great in power
supplies.
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post #6 of 7
8/30/05 at 5:27pm
Quote:
These days virtually all tube amps are otl
Interesting. Can you post some examples ?
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post #7 of 7
9/2/05 at 2:22am
Here's one that I've been eyeing after building two Millett-Hybrids and being charmed by tubes. I simply love the idea of using "living" antiques that were made before I was born...(I apologize in advance if you've all seen PM's pages before):

http://www.pmillett.com/ecc99_srpp_headphone_amp.htm

It's got a 12au7 and two ECC99, and output transformers to boot! Note there are two schematics, one specifically for AKG 1000 and one for the rest of us. The whole page is an educational read. Watch the high voltages!!!

cheers,
ottopig
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