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

[Bill Smith]

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?
73,
Bill

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Bill Smith KO4NR

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