I ordered a set for my '66 Bassman and another for my '67 Bandmaster because of all the positive reviews. I was a little skeptical, but they are really amazing. Nice warm sound and the mids are great for older Fender amps that tend to lack in that department a little. Cranking the Bassman with these tubes never sounded so sweet. With the 30watt plate dissipation, I found myself biasing a little hotter than I normally would, but man... so good! These are easily the best new production power tubes I've tried.