that board's a blast from the past!Yup, Aleph X headphone amp with Jfet frontend and FQP3N30 ccs/outputs. For now I have it biased at 0.5A with +/-15V rails. With the X'd circuit that's 30W dissipation per side.
I have yet to listen to the amp, the setup is still very experimental. Next I'll be adding a DC servo I suppose. The semis are tightly matched and track really well thermally, so in theory it should work without a servo, but it's an easy enough tweak and brings some peace of mind.
Amazing. So neat, so professionally done!Here some additional pics from build-up
Hello,
they run fine since nearly 3 years now. 1 had a fault because of a faulty mica pad in the LTP-CCS.
I must admit that mine run in low-power bias at 95% of the time because of power consumption. 700W / stereo at full throttle is a little too much for me in the actual „green“ world with expensive electricity. But a friends amps run at 100% with no problem.
Sound wise they convince since day one, but we have annother project in work, giving a hard match for the aleph-JX with a more conventional output stage running at lower bias.
Regards J-C
they run fine since nearly 3 years now. 1 had a fault because of a faulty mica pad in the LTP-CCS.
I must admit that mine run in low-power bias at 95% of the time because of power consumption. 700W / stereo at full throttle is a little too much for me in the actual „green“ world with expensive electricity. But a friends amps run at 100% with no problem.
Sound wise they convince since day one, but we have annother project in work, giving a hard match for the aleph-JX with a more conventional output stage running at lower bias.
Regards J-C
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Google Translate:
Good morning, I would like to know if it is possible to buy pcb for aleph x in the new version or if I can get gebbers for pcb printing. Thank you and best regards.
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I figured you'd still have a small stack of boards, William!
Tom, once you get your boards, have a look at my web page for the Alexph-X (https://sites.google.com/bucknell.edu/ericshometheater/erics-home-theater/aleph-x-clone-amps). I haven't touched it in years, but it still has a ton of great information about building this amp and my set of amps is sill running strong.
Tom, once you get your boards, have a look at my web page for the Alexph-X (https://sites.google.com/bucknell.edu/ericshometheater/erics-home-theater/aleph-x-clone-amps). I haven't touched it in years, but it still has a ton of great information about building this amp and my set of amps is sill running strong.
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