Ruby KT88STR Power Tubes Matched Quartet
Ruby KT88STR Power Tubes Matched Quartet an entirely new KT88 sold in a matched set of 4. Built in the style of the early British KT88.
All RUBY™ Tube power tubes come already matched. There is no extra charge for this service. The Ruby Tubes matching process is very exact and our tubes are matched within +/- 1 mA (mille amp) of each other.