G600

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.

Yep, i found a small 30va rcore with dual 15v secondaires. Will mesure if it fits. Half the price of the trafo rework, not mentioning the lead time. But i still feel dumb...

I'll see what Mr Monaghan can do then...

OK, there is the culprit. So I jumped both feet into Lil Knight's error (boards markings, etc...). Would you share a solution, other than reworking the secondary ? I could put 63V caps, but max DC for the 7X12 is 35V...

Today I triggered my PSU. Before I had a chance to measure high voltages, I heared something boiling. The two 4700µF were hot and their tops are now convex. Sounds like an overvoltaged cap, right ? Maybe the center tapping is confusing me, but why a 25v rating for those ? Isn't the 30-0-30 rectified to 42v ? This way 50v seems to be the minimal requirement... Any thought ?

Pretty damn scary ! But start with serious soldering. Like cutting the sand's legs. Like not putting that much solder (2nd picture, at the 10M90S). And source genuine components from reliable sources, even if it can be expensive.

I have stuffed my amp boards with them. I'll let you know how they react.