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Class A headphone amp - novel design
Phil Dodd
Posts: 3,975
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Anyone who dabbles in constructing gadgets might like to look at a design just published on the "Instructables" website. It is for a class A stereo headphone amp, using a double triode valve feeding FETs !
He claims that it gives exceptional audio quality, although is not very portable thanks to a hefty lead-acid battery ! But even the valve works from 12 volts !
I must admit, the best amp that I ever built quality-wise was a class-A headphone amp, using a single VN67AF V-FET per channel. Great sound, especially the bass. It even used to drive a pair of Leak sandwich speakers, again with reasonable bass. It did run quite hot, but FETs are resiliant to thermal runaway. The battery ran hot too !
So this guy's along the right lines to have a hefty battery linked up.
Anyway, if headphone amps are your thing, the project is at :
http://www.instructables.com/id/Class-A-Hybrid-Headphone-Amp/
Happy listening ! Phil
He claims that it gives exceptional audio quality, although is not very portable thanks to a hefty lead-acid battery ! But even the valve works from 12 volts !
I must admit, the best amp that I ever built quality-wise was a class-A headphone amp, using a single VN67AF V-FET per channel. Great sound, especially the bass. It even used to drive a pair of Leak sandwich speakers, again with reasonable bass. It did run quite hot, but FETs are resiliant to thermal runaway. The battery ran hot too !
So this guy's along the right lines to have a hefty battery linked up.
Anyway, if headphone amps are your thing, the project is at :
http://www.instructables.com/id/Class-A-Hybrid-Headphone-Amp/
Happy listening ! Phil
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Comments
gosh, controversial!
Still at least he's honest about his reasoning for doing, they glow
Yes, I've always absolutely hated that wrong way of wiring a volume control - and can't ever see any reason for doing it?.
And like you can't see any compelling reason to do it that way either.