Alex Cavalli basically stopped supporting the DIY crowd (understandably) when he went commercial. I don't expect to see his pages back online unless he goes back to DIY... hard to foresee. When you are interested in information about the EHHA's though I advise to visit the Way Back Machine...

Kletchy says that the tube is badly implemented in terms of grounding and suggests to connect pin 9 directly to ground instead to the pcb ground... when I read him correctly. Could in fact be that the boards have an inherent mistake in them which would be the reason for many having trouble...

I know what you mean... I would have long set it aside for good. ;)

I remember very well your continuous fight to tackle the hum issues.. Same as muskyhuntr I sold my EHHA a few years back while it was still on the breadboard... it was absolutely quiet then with a "standard" star ground. --> everything goes to one point connected to chassis, but there can be...

  The builder of 'The Wire'? That would be member OPC over at Diyaudio. 

Do you have a schematic? Without one any advice is impossible.

Difficult to make a guess when the output was shorted.   It could still be the CRD's (current regulating diodes CR1, CR2) that are quite fragile. But I would ask my questions over at the Amblabs forum... Ti Kan is present there and usually replies in a matter of hours.

No reason for laughing... you did everything right! Now just put it in  case big enough.

Not a good idea. You can omit connecting power ground in digital gear or other low power devices, but you should never do that in anything that contains the word "amplifier".  When you only can get your gear humfree with leaving ground unconnected your wiring or else is bad. There's also...

  The board in question is from Amb Labs... the Epsilon 12 muting thing.  

Are those the transformers from Rondo Müller? If yes I am relieved since I suggested them when I recall correctly... I just had a big transformer made by Rondo for another project.   Happy New 2016!

You have the kit, you do know how to do a clean solder job, you probably have the tools... that's a good way to start.   You don't necessarily have to be able to read the schematics when stuffing the boards... follow the BOM and the designations on the boards, CAREFULLY check which part goes...

"So, you consider yourself a master do you? In what way does my espessivo resemble your C3g?" First, No :D Second, ... forget about it. Did I say no pun intended?

@ Kolyas:  Nice project... you could have mentioned that you also obviously took inspiration from my C3G SET amp  No pun intended.

I am selling my unfinished EHHA RevA --> boards all populated and fully working (had it playing on the breadboard for months). Standard psu exchanged with a pair of Salas shunt regs. For details look here:  ...