RE EL34 tubes

[Joe]

I do repairs for many music artists amps here, brands like Fender, Marshall,
Mesa Boogie ect

In most cases you need to increase the screen resistor from 470 (6L6) to 1K
with a EL34/KT90
Also many amplifiers use the blank pin 1 on a 6L6 socket (Cathode and G3
internally connected  )as a tiepoint for grid resistors,
simply plugging in a EL34 may get you a suprise and visa versa (shorted bias
"EL34 to 6L6").
Usually, you need to move something on pin 1.
Once a socket is properly modified power tubes are interchangeable with a
bias adjustment and sometimes a feedback tweak.
1K ohm on the screens is fine for both types of tubes.
NOTE :"This is the case with the gear I work on here"

The Svetlana EL34 is the most popular right now for rock n roll players at
the bang for the $$
NOS Phillips and Blackplate RCA's 6L6 and Mullard EL-34 for the guys with
money

-----Original Message-----
From: Holden <holden at NAC.NET>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Thursday, September 14, 2000 6:36 PM
Subject: RE EL34 tubes


>Has anyone had any experience exchanging the EL34 with a 6L6? Appears
>the base pinout is close enough assuming the EL34 circuit has the
>suppressor and cathode tied together, and ratings on the two tubes are
>fairly close except for different grid currents and biasing levels. I
>have an Eico plate modulator (so fidelity is not a REALLY big concern)
>which uses the EL34s, and being able to swap for the 6L6s makes sense
>for everyday operation if it works OK. Comments?
>
>Howie WB2AWQ
>
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