[Amps] 3-400Z vs. 4-400A

Bill Smith ko4nrbs@yahoo.com
Fri, 5 Jul 2002 07:55:54 -0700 (PDT)

Some time ago a guy told me he was substituting the
4-400A tube in his Swan Mark 1 amplifier instead of
using the 3-400Z tube.  He had a large supply of the
4-400A tubes on hand and said they were working very
well in the Swan Mark 1 even though it was designed
around the 3-400Z tube.  Is this an ok thing to do in
the long term?

Bill Smith KO4NR

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