G600

But not cheaper than EL34 !

This is pretty scary !

A detail that could help other builders : I had to deal with a hard to adjust channel. It crackled sometimes, with blinking LEDs. I was quite desperate, and started to read the batteries adjustment techniques again. First method was Inu's, 10k at the middle and 2k full to R32 side, not good. Then, I tried to adjust without using 2k, no crackling noise, but some random "whistles". KG's silkscreen patern, all trimpots centered, not good either. Finally Kerry's way cured the thing : 6.55V at 22k resistor using 10k pots while keeping 2k centered, then fine tune with 2k. So keep in mind that each build and each channel is unique. Be creative, walk sideways. Now the sound is scandalous, like I said... PS : 95 % Takman even in the batteries, not even raised above the PCB 750 Ohm at k216 gates 2*5pF compensation caps Matched 3675 at parallel spots Balanced and noiseless Sylvania "Green Hornets" 6922

It is scandalous how good this amp sounds. An everyday amazement, thank you all once again for making it buildable.

Okay, a small saving then !

Any reason not to build a balanced version of this ?

Anybody with a working build ?

Thank you Inu, your advices, comments and photos were so useful !

Thank you gents. A very bold attention to K. Gilmore, Birgir, "from overseas" George, Kubo and all the ones behind the project. Kerry, your iteration is nothing short of sexy. Almost to the point of building one !

Gentlemen, it's christmas obviously. Today my T2 is making its first playback. I have just received a Birgir modified 007A. Yes, I haven't owned anything from Stax since today. It sounds so effortless and so wonderful... and weired noise free even with my 95 % Takman build (no Xicons, Inu's style). After 10 months of careful building, it's alive. Maybe the first KGT2 in France ? If there is a Xmas magic, I must have tasted it today.

s_r, any news on your noise problem ?

Adding a wire fixed the odd behaviour of that particular output. Now everything tests fine. But if I'm correct the gerber files need correction.

I have removed near all of it, this picture is several months old. And crappy as usual. Kerry, that is a massive achievement, cheers !

I have just checked KG's gerber files, and they don't have the trace. Waiting for the master's input before modifing anything. "Better safe than sorry"

Sorry, maybe I wasn't clear. I can't understand why I don't have a trace here :

Yep, pretty sure of that. I think I have spotted the difference that can explain why I have one output stuck at 1.6V above ground. Control picture courtesy of Inu. Could you guys confirm this is a board bug ?

What voltages would you consider OK - between + and - output - between +/- and ground - difference between batteries ? I can dial the outputs to less than 100mV between them at the expense of a little difference between batteries. And the outputs are 14 to 16v above ground, except for one that is only 1.6V. I guess this isn't good...

Nope, I only adjusted the batteries, no idea of the offset. Outputs not wired yet too. And DAC not in the same room. And.... :D

Sure, we always need something better. That said, nothing blew up, adjusting the batteries was very easy, and I didn't knew I would go that far without electric trouble. Seven months sourcing and testing parts... only a few steps away from music !

Gentlemen, I sweat beyond reason, but it's getting somewhere. So exciting !

Don't you have a friend with a scope ?

Gread gods, that's a masterpiece !

I could use a pair.

My Klone is now 99.5 % complete, and breaking in. It's more than a pretty nice amp, drives both my HD600 and LCD3c beautifully. Sadly I don't have unbalanced out from my DIY DAC yet, so feeding it with an Aune T1, not bad but quite edgy and unrefined. I'll take some crappy pictures for your pleasure when the knob thing will be done.

My PSU is alive ! I put a 15VA Talema toroid for 15-0-15 and it's fine. All voltages test fine with no load, except the -12V at -15.XX volts. I'll replace the 7812 and 7912, along with the overvoltaged caps. Then I'll heatsink the amp part and test it too, but still waiting for proper screws (the joy of sourcing US screws in metric Europe...). Bad news is the postal services have lost a quad Sylvania Green Hornets... so short of input tubes too.