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From: "LORD VALVE"
To: "zzz"
Subject: VISSEAUX 6V6 TECH BULLETIN (from Lord Valve)
Date: Fri, 30 Apr 1999 02:09:08 -0600
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A NOTE FOR VISSEAUX 6V6GT USERS...
If you're installing this tube in a Fender amplifier
(or in any amplifier which has the power tube sockets
wired the same as those in a Fender) you should be
aware of a potential problem. The Visseaux 6V6GT
has a metal shell at the base; like many tubes which
use this construction, this shell is internally
connected to the #1 pin of the tube. In a Fender
amp, pin one is used as a tie point for the 1.5K
swamp resistors, and the negative bias voltage is
present there. If your amp has butterfly-type
tube retainer clips, these clips can dump the bias
to ground, thereby destroying the tubes in short
order. Three different remedies are possible:
1) Remove the tube retainers. The Visseaux has
seven pins on the bottom; unless your sockets
are extremely worn, you won't have to worry
about the tubes falling out.
2) Push both sides of the clamps down against the
chassis so that they can't touch the bases of
the tubes.
3) Remove the swamp resistor from pin one and fly
it off pin five, Marshall-style. While you're
at it, change your screen resistors to 1K/5W
types and tie pin one to the chassis.
Enjoy!
Regards,
Lord Valve
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