[Boatanchors] 4-400 tube replacing a 3-400z for circuit test

[Mike McCarthy, W1NR]

They will probably work fine, as long as all 3 grid/screen pins are
connected and grounded the same.  However, the 3-400 chimney is too short to
fit the 4-400 or 3-500.

Mike, W1NR
 

-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Greg Mijal
Sent: Thursday, December 14, 2006 6:12 PM
To: boatanchors at mailman.qth.net
Cc: glowbugs at piobaire.mines.uidaho.edu
Subject: [Boatanchors] 4-400 tube replacing a 3-400z for circuit test

Hi:

Has anyone used 4-400's in a made for 3-400Z's amplifier?
I have a Swan MK 1 amplifier built for two 3-400Z's and no tubes.  I do have
a set of 4-400's.  The necessity of this is to evaluate the amplifier
overall circuit, not necessarily "Convert" the amp.
Anyone do this one before?
Thanks
Greg
WA7LYO
in sunny Feenix
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