I built up the first of the eiclone halves and have been testing it for the past couple of evenings. I was a little concerned the gain might be low due to the 6SL7 front end. Looking thru this forum I found Shannon's numbers for distortion results. He used 600mV RMS for full power, I tried this and low and behold it made exactly full power @ that input. I started out with KT88s running 72mA @ idle, they made 66Vp-p across 10 ohms for 54 watts RMS. I looked at these numbers and the 475 volt B+ and thought 6L6s could probably do the job just as well. A couple of Sovtek 6L6GBs were found and substituted. The idle current was set to 35mA and the input set to ~600mV. The amp now made 70 Vp-p, for 61 watts; huh, more power. Looks like 6L6GB it is. Although I haven't tried the EL34s.
I would be happy to build the amp with KT88s but would want a B+ of ~550V to make it worth it. I wish I had looked a little closer before I ordered the transformers. The same amp with sockets for a quartet of KT88s and 550V B+ would really kick ass! Or, wait a minute, six of 'em YA! SVT LOOK OUT!!!
BTW:I noticed Shannon changed the feedback resistor and cap, If I made this change, what benefit would I see?
Don