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RE: EH 6V6GT or JJ 6V6s

Posted by DewDude on March 24, 2017 at 18:45:54:
I am hoping that like...it was just a fluke that something failed and that tube went the way it did "for no good reason". I know the amps were rebuilt in 2008, I don't know how old the JJs were when I bought them back in 2011. I swapped rectifiers after I got them because the Sovtek's they came with had a hotter B+ and these things were already at what I thought a 6V6 amp should run. I'm pretty sure I may have abused those tubes before I did that.

I ran them for about 3 years before I swapped a pair of soviet 6P6S tubes in I had laying around, the datasheets indicating my voltages were way too high, but I was having one of those nights were I was like "let's see if they melt". They were much like you described the classic 6V6 tone...very rich midrange. I came to like them after 100 hours or so. I ran those until a few months ago when one developed a problem with the cathode shorting to filament; I pulled the JJs out of storage and slapped them in.

It was kind of like a slap in the face; those Soviet tubes sounded a bit muddy in comparison.

Oh well..I'll get something ordered next week.

I still have to wonder if this wasn't a sudden death but rather a bunch of stuff I didn't notice leading up to the lightshow. That very same amp "ate" a 5Y3 earlier in the week; the one I had in there decided it didn't want to make a lot of B+ after it got hot. I put a replacement 5Y3 in it; but I later wound up swapping in a 5R4GY "because I could" and...maybe with the fact my amps are a pretty light load compared to a 5R4's current handling; the B+ was a tad higher and just allowed the problems to continue....I spend a lot of my time looking at how something broke after I fix it...and doing what I can to make sure it doesn't happen again.

But it's Friday..I'm in a mood that I want my tunes at any cost; and since these amps are consumer equipment built like some of the jukebox amps I've services...I broke all the rules and split a pair of non-shorted JJs and the good pair of the Soviet tubes between the amps.

Sounds fine. No smoke. Overly large OPTs aren't hot after a few hours of use. I think I can limp along till I get a new quad in...so I got that goin for me.