Bill,
It's been a while but if I recall correctly all that is needed is to
change to low profile plate caps. the 500 are slightly taller than the
400. Also when SWAN went to the 3-500 in the Mark 2 and Mark 6 they
added some bias in the form of a zener diode, 3 volts I believe. I
know some who have put in the 500's and not made the bias mod with
no apparent problems.
Art
KB7WW
Bill Smith wrote:
>
> What is involved in replacing the 3-400 tubes in the
> Swan Mark 1 with 3-500ZG?
>
> Anyone had experience with this amp?
> 73,
> Bill Smith KO4NR
>
> =====
> Bill Smith KO4NR
>
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