ZeroZone JLH Kit

[DreadPirate]

I collected some info on this amp available by kit or assembled on aliexpress and ebay. In kit form, this can be had for as low as $17.

 

[Ian Finch]

This is a headphone version, not quite like JLH's but you wouldn't want to bias it for more than a watt or so in class A with heatsinks that small. For a few bucks more on the kit, you could have a 10-15 Watter and use some nice speakers.

 

[xrk971]

There’s a whole big thread on this circuit and the various kits from China. It sounds quite nice but tends to have a bit of a large dc offset.

JLH Headphone Amp

I have the Zerozone version - many people say that there are a few parts that need to revised or switched in polarity - I built it as shown on the silkscreen and it seems to work fine.

 

[DreadPirate]

I think I will get it, cheap enough. So this board can be made to run at 10W with a proper heatsink?

 

[xrk971]

It’s a headphone amp - not a speaker amp. I think it can run maybe 1.6w into 8ohms. I actually hooked it to my 91dB sensitive 3FE22 and it played pretty loud but it’s not a 10w amp the original 1969 JLH.

Here is me running a speaker with it:
http://www.diyaudio.com/forums/soli...bay-setting-bias-output-help.html#post4662672

You want this kit if you are interested in 10w.

LJM HOOD JLH 1969 Class A Power amp kit 2 channel amplifier 10W+10W | eBay

But if looking for a 10w to 20w Class A amp, why not try the latest and greatest with almost 50 more years of technological and topology advancement?

Try the Alpha 20. You will be happy that you got the extra 10w, and the amp will be superior from standpoint of dynamics, efficiency, soundstage, dc offset stability, and adjustment free.

Aksa Lender P-mos Hybrid Aleph (ALPHA) Class A Amp GB