CJ Premier 15 & 17LS Tube Suggestions

I have a 17LS, and with the stock Sovtek 6922's its dead quiet at all volume levels. If you also have Sovtek's, its likely that one or more of those little guys is having a problem, or that the noise is coming either from the 15, or from somewhere else in the chain.

-- Ken

I replaced Sovtecs with so called Russian military grade tubes on 17LS with no great improvment. I recently replaced those with Mullards. Serious improvment there. Much clearer, sweeter & more dynamic. The others sounded quite flat by comparison.

Different preamp, but I have the premier 14 and replaced stock 6GK5's with Mullards and the improvement is not subtle. Much sweeter, more bass, richer midrange. The 14 is absolutely quiet with both types of tubes.

Ditto, Pops. Mullards put the 14 at a level I feel only the 16LS can beat. Our 14LS is running selected, matched pairs and was compared--at length--with the 6922/17LS. It was no contest. With gain at 99, you have to have your ear next to the Avalons to hear any tube noise. Mullards are far superior to GE, Sylvania or any other 6GK5, all of which I tried. I also found Sovtek 6922s weren't the answer in another preamp. They're undoubtedly used widely because they're readily available, quite reliable and cheap and, in many applications, apparently provide acceptable response. As for milspec examples, of which there are three or four grades priced accordingly, I have no direct experience, so can't say all 6922s are undesirable.