RL> Cool.
       :) DAMN cool. :)
 RL> I don't know if a KT66 is a drop-in replacement for a 6L6 or not.
       That's what the Torres catalog says. "The Holy Grail! The best 6L6 
ever made." Probably a relabled 6L6.
 RL> The bias sets your actual potential difference between the plate and the
 RL> cathode.  If the potential is too high, the tube will arc internally.
       Yeah... All I need is carbon residue inside the tube and for the thing 
to short out on me, huh? :)        Let's say I'm running a Silverface Fender 
with a 6V6 power section.
What's the normal bias that most people set it to? Would it hurt to jack the 
potential up about 10V? Would it even make an audible difference?
 RL>  TS> was going to build to the Blackface spec.
 RL> This is true.
       Wow... I retained something. :)
       So, this confirms my belief that Leo did know a lot more about what he 
was doing than CBS. :) Like it really needed to be confirmed, though. :) 
 RL> They know, but the tubes' published specs are ###v, so they built to 
eet
 RL> those specs.  Building to exceed the published specs would increase the
 RL> cost.
       So, they can't do the occassional special run at the preferred specs 
for Fender or Mesa or Marshall? :)
       Hey, Duncan. Tell the guys over in Marketing to call up Sovtek and ask 
them about this. Sell them as Custom Shop Special tubes. :)
 RL> These tubes are used in amplifiers *probably* 100%... however, not all
 RL> amplifier users desire distortion or run high plate voltages.  Many
 RL> audiophile amps run plate voltages that could smoke the best tubes made
 RL> in the '50s, but they are biased so "cold" to prevent distortion that
 RL> it's not a problem.  All current guitar and bass amps run voltages which
 RL> are within these ratings... Fender was one of the few companies that 
ent
 RL> nuts with the B+ level, and that represents a comparatively small 
ortion
 RL> of the market.
       And that was only back with CBS that Fender went nuts on the B+, 
right? If so, that is an ultimately small portion of the market. My question 
is, though, why the hell is the Twin so damned clean and loud back in the 
Silverface models with the B+ that high!?!? :) But the Twin is running 
6L6GCs, though, so that's a small part of it...
 RL> The 12AT7 is a low-gain version of the 12AX7.  The 7025 is basically a
 RL> 12AX7.
       OK... I'd probably want the 12AX7, knowing my tastes... I wonder 
what's in there right now... I wish I had it already. I could go check. I 
remember looking in the back and seeing new tubes. I think that they were 
s.
 RL> 7 diodes?  It's usually 4, connected as follows:
 RL> Again though, I'm not familiar with Showman... I'd have to see the 
int.
       I could send you the schematic, if you want me to. I have it in a JPEG 
as the guy sent it to me. If you have another source of schems, look for 
Model AB-763. The thing about the schematic that seems odd to me is that in 
the power section, TR1 has a spot on it that doesn't seem to be connected to 
anything, until you look to the right and see TR2, which has one end of the 
transformer powerup, but no source from the AC receptical. I think it's part 
of the one transformer, but a seperate tap that seems to be staying AC... 
Dunno what it's about... But that's where your experience and knack for 
explainations come in. :)
 RL> All of the tubes.  The 12A?7 series are 12v heaters, but the heaters are
 RL> center tapped, so you tie 6.3 to the center and each end to light the
 RL> whole thing.
       So when tubes are waisted decoratively, the voltage is applied to 
heater? :)
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