My new go-to for AC30
After being a little bit disappointed with a couple sets of JJs (noisy, seemed to lose life fairly quickly, some were REALLY bad), I've tried out a set of these, and a set of the TADs. Quite simply, these tubes are fantastic. They easily were the best performers in my AC30. The JJ's sparkle and chime (when they work), but they're noisy and a bit unreliable. The TADs are VERY neutral sounding, which doesn't seem to suit the AC30 very well, but works ok in my american style amp. The Tung-sols have a chime that almost matches up with a perfect JJ, and everything else about the tube is superior. They have a tighter, better sounding bottom end, they're more balanced throughout the frequency range, and they are incredibly solid in construction, with practically no microphonics even when pushing the amp HARD. They have quite a bit more gain and a little more headroom than a JJ, which actually suits my style better, but my AC30 can quite easily push them to the brink, and when it does they break up beautifully. I wanted to wait until I had the chance to use multiple sets before rating them fairly, and I've now used 3 sets each one performing fantastically. In fact, they last so well, that I usually have to remind myself to change them or else I just leave them in until they're gasping for air. I love these tubes and highly recommend them for any EL84 powered amp, but they work wonders in my AC30.