Thank you for all that.
No more TAD EL34B-STR's for me. My last 2 sets lived short lives. Even though they were biased on the lower end of their operating range. I could be wrong on this, but I understand they come from the Shuguang factory where production of tubes has been shuttered.
I find buying tubes this past year has been a crap shoot. Just the way it is sometimes. I can only imagine what a PIA it is for Friedman.
I've got an old set of Mesa branded STR's in my SB50 at the moment. We'll see how they hold up.
I've got a set of JJ's coming from AES. We'll see how that gamble works out.
I'm left with doing my own testing (if you can call it that) letting these things burn a while in the amps I use the most. Especially the Wizards where they'll get harsh treatment. If they live in those a while, then they should live in my others as well.
I'm going to start pulling them after a good hard 20 or so hours, and hang onto them as spares.
Oh well.....I suppose we're lucky to even be able to buy something as ancient as vacuum tubes anymore.
When you factor in the differences in peoples hearing, and the inconsistency in vacuum tube mfr's,...........getting tubes I can be relatively satisfied with long to moderate term seems impossible lately for me.
I'll have to lower my standards.
472VDC on the plates/37.5mA biased. The old spare set of Mesa branded tubes held up fine for a total of 20hrs. No problems. I've stowed them away as spares.
The new set of JJ's from Antique Electronics Supply are also holding up nicely under the same. I think I'll slowly build up my own spare stock and just run them through my own amps over several hours as the test. The stuff coming out of the Reflektor and Slovakian (JJ) factories is cheap enough. No more chinese crap though for now.
Probably dumb luck........but I've bought numerous sets of tubes from AES, and never a problem.
I'm certain other people hear the differences in these different sourced tubes, but I can't unless they are on the verge of some type of failure. At 63, I'm certain some of that is gradual hearing degradation, and self awareness of confirmation bias.
When one considers what goes into vacuum tube manufacturing, I'm still amazed these days that the few places in the world that make them still do. The audiophile, guitar amp, and amateur radio RF amp market is such a small niche market, hell I guess we're lucky we can still buy them at all. There just can't be that much money in it. I suppose the Russians and chinese still use tubes for other things. I mean......the valve guitar amp market is so small, I can't see any way in hell that by itself could support the tube manufacturing effort financially.
Also had great stuff from Mike Kropotkin/KCA tubes. Got a set of 6p14p/6n14n (EL84 type) coming for my Matchless Lightning.
Don't get me wrong......I love all my tube amps. I've got a shitload of them, and hardly any room for anymore. But the rash of tube failures I've had lately makes me want to say screw it and go solid state.
But really.....all things considered, I have very little to bitch about.
I can't imagine what a pain in the ass scourges of bad tube batches can be for someone like Dave Friedman/Boutique Amp Distribution.
We just don't appreciate how good we have it.