Those JJ 6V6s are kinda..."hard"... sound a little like 6L6s.... I prefer the "normal", (softer?) 6V6s... I've had good results with the new Tung Sols and Electro-Harmonix.
I haven't tried Sovteks in awhile, years.... but I'll have to look into them again, thanks for that!
I going to have to admit my Princeton doesn't have all NOS tubes anymore. It did when I bought it but a few tested bad and were replaced by the tech. I found out after the fact that he had replaced them with non-NOS. He said NOS just wasn't worth it anymore. I figured I'd at least give his recommend ration a try before complaining, and sure enough, the amp sounds great.
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I haven't tried Sovteks in awhile, years.... but I'll have to look into them again, thanks for that!
The power tubes don't actually say Sovtek from what I can see but rather "EHX" and "Made in Russia".