Stay with 6922, do not try 12AT7. This kind of statement sadly gets mis-understood and takes on a life of it's own. You probably won't hurt your preamp by doing this, but by doing the reverse (a 6 volt tube in a 12 volt hole) you can damage your gear. Stay with numbers that the manufacturer states is OK. In the case of the Mod 3 and L-1 that would be 6DJ8/ECC88, 6922/E88CC, 7308/E188CC and CCa. Some folks use 7DJ8 too. On this Russian 6922 thing...Sovtek is an export name. I have eight different types of Russian 6922 and of those there are two that sound excellent. Of those two, one of them we can get only about a 40% yield that are good enough for the Mod 3A. The other one is better. And lasts. In fact, one guy who lurks here that bought his Mod 3A from us prefers the special Russian 6922/6H23 tube to our much talked about Tungsram.
Tube replacement for Audible Illusions
Hello, I have had my Aud. Ill.L-1 preamp for about 5 years now, I've replaced the tubes three times with what it came with,Sovtec premium grade 6922's[so they say] Has anybody had any luck with other tubes that might be better than these? If so, how do they compare? Thanks for any info.