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In Reply to: RE: EH 6V6GT or JJ 6V6s posted by Eli Duttman on March 24, 2017 at 17:52:20
The datasheet I saw for the 7C5 listed a max plate voltage of 315V; my amps run higher than that. Hell, the max screen is listed as 285V and my amp is running them at 330V They look cheap enough and I'm sure I could construct adapters if I wasn't pretty sure they'd explode once the B+ hit them.
I'll have to give some consideration to the new production TungSol's; they're a little more than I really want to pay right now.
Follow Ups:
Of all the JJ octal tubes, the 6V6S seems to be the most consistently ok tube. It's just the way the 6V6S reproduces music. It's tone is not classic 6V6GT, with a rich midrange. More of a 5881 tone. Bass and treble. A little thin in the middle.
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.
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