I just wanted to add to this dated topic as I've just recently picked up my 2nd GE-10 recently off craigslist here in Los Angeles for a mere $90.00 USD.
I use them as a stereo pair with Radial RMP Pro reampers feeding them line outs from my daw and GT direct boxes feeding the outputs of the GE-10s back into my interface so i can use them on group sends or entire mix busses.
I love, love, LOVE the coloration these things bring to the table. There is minimal (if ANY) noise the way I have them set up and the character they impart is very positive to my ears. Love them on a drum buss. it's like having two API 560's at a fraction the price!
Yes, they don't have the proportional Q (that I'm aware of) or the API transformer sound but GOSH DARN IT they do some magic.
Anyway, hope that little bit of info helps someone!