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echo: guitar
to: TOM SCIOSCIA
from: RICH LOCKYER
date: 1998-02-17 03:22:00
subject: Marshall Madness

Hello Tom!
On 16 Feb 98, Tom Scioscia wrote to Rich Lockyer:
 RL>> Nope... not true G.A.S.  A true G.A.S. sufferer has no remorse after
 RL>> getting home.
 TS>        No remorse until the wife has a real fit, though. :)
Not even then.  He just buys her a new piano (Hi Lee!)
 TS>        Say that an amp with four EL34s were biased as high as they could
 TS> be, of course within reason, how many watts would that hit? I remember 
you
 TS> saying something like it has a tolerable limit of 700V on the plate, 
which
 TS> is somewhere about 175% of the 6L6GC (which I think is 460V). Could I
 TS> assume that somewhere between 160 and 180 watts could be achieved if
 TS> pushed like that?
Check the specs on the Ampage web site.  Look up the design limits for the 
two-tube push-pull class AB, and double it for four tubes.  I THINK the 
absolute maximum dissipation for the EL34 is around 30 watts (each)... 
meaning that if you push the plate voltage to the limit, it's going to be 
biased VERY cold to keep the dissipation within limits.
 TS>        Actually, it was closer to 8 and I ran it on the clean channel, 
but
 TS> I'd still expect something... Think it makes a difference that it was 
5881
 TS> equipped?
The clean channel doesn't do much crunch, but the 5881s did have something to 
do with it.  There's nothing wrong with a 5881/6L6GC, but some amps weren't 
designed for them, and the Marshalls were slightly modded (at the factory) to 
accept them when the EL34s were in short supply.
C-ya! Rich
--- GoldED 2.40
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* Origin: Hiroshima '45 Chernobyl '86 Windows '97 (1:218/704)

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