The original KT-88s were sweet and grainless with an excellent midbass foundation, but a bit soft in the extreme highs and just a little veiled-sounding. When we went to the EATs and got them broken in, the amplifiers still sounded like themselves, but now they had an extra measure of transparency, high-frequency extension, and a much tighter and well-defined midbass, with much more extended and controlled lower bass. Enough almost to defy logic.

Tube Retail prices:
KT-88 Standard Series (I used these for the review):
KT88 (matched pair): $235/ea ($470 per pair)
KT88 (matched quad): $250/ea ($500 per pair)

Diamond Series
KT88 (matched pair) $250/ea ($500 per pair)
KT88 (matched quad) $275/ea ($550 per pair)
300B $440/ea