Outputs tubes that can take 500+ volts

[Gary Brennan]

Which octal output tube types and mfgs. (new and os) can take over 500 volts (for a GT Solo 75)?

GB

[Blue Strat]

Any NOS 6L6GC, SED 6L6GCs, any NOS EL34 (except possibly Siemens) and SED EL34s.

[John Phillips]

And 6550s and KT88s.

[phsyconoodler]

I've been using 505v on my Super Reverb for the last two decades.I just throttle back on the current to save the tubes.I use new production tubes with no catastrophic failures.

[Gary Brennan]

I found some old GE 7581A/KT66 tubes. Can they handle 500+ volts?

gb

[Greggy]

My Soul O 45 runs at 510 volts. JJ 6L6GC work just fine.

[Swarty]

That GE 7581/KT66 would be fine, although it bears no resemblence to a KT66, it is a very good 6L6GCs.

Some others: 8417, 7027A (although later varieties of this tube appear to be nothing more than a repinned 6L6GC).

[tmac]

My Ampeg V2 runs about 580V. I'm trying some TAD 6L6WGC RCA copies right now. Put 'em in last night but didn't get a chance to crank it yet. That'll be tonight :AOK

[PRNDL]

The 5881/6L6WGB was first developed by TungSol for the US Military. They are in short stubby glass envelopes.

6BG6 is also possible. The 6BG6 has a plate connection at the top of the tube, which means it can easily handle plate voltages in the 700 Volt range.
http://www.vacuumtubes.com/6BG6.html

[Lex Luthier]

I'm running JJ E34L's at 675 volts and they are holding up fine so far.