Oh yeah. Not because they sound better than the EH's, which they do only by a small margin, but because of the small bottle. On the 1000A, with EH's onboard, I put HVAC Aluminium Tape on the sides of the transformers facing the tubes, the temps dropped about 5-8 degrees depending on which transformer. The small bottle tubes caused a further drop of another 5-10 degree's mainly due to air flow around them, and the transformers. When I moved the large power resistors (replaced and moved) the temps are now about 120-130 vs. 150-160 with the EH's and original setup. I still use the EH's in my 800-c's as they don't impinge on the transformers and the heat goes straight up. Why throw out a perfectly good tube. But when the EH's die I will put Tung-Sol's in them.