My experience with ke4mcl wasn't as good as these. We made a deal on trading some amps and tubes, but the tubes I was supposed to get (5881s that he had in BT) got "lost" at his place after I sent my part of the bargain. Then the number got disputed (I thought I was getting 17 and he thought I was getting 4. I ended up with a Heathkit W9 and a single 5881, for a Maggie 9203 stereo amp, a pair of Maggie 6V6 monos, a Masco mono amp, a pair of ST 6v6s and 3 or 4 ST 5U4s. Add to all that 60 bux in shipping, and I feel sort of "screwed". When I suggested we trade back, the amps I had sent were already gone. He did offer me some 5963s (12AU7) "to test", but I have hundreds of those myself. I would just say, make exactly sure of what you are giving and getting.