[Swan] tube tester

Maynard Wright m-wright at eskimo.com
Tue May 22 07:53:43 EDT 2007


Oops!  Where I wrote "output of two tubes in parallel," I meant to 
write "output impedance of two tubes in parallel."

73,

Maynard
W6PAP



On Monday 21 May 2007 17:13, Maynard Wright wrote:
> One thing to keep in mind is that the dual tube Swans use a somewhat
> different tank circuit (PI or PI-L) than do the single tube Swans as the
> output of two tubes in parallel is lower than that of a single tube.  I
> wonder whether you might be able to compensate for this when using only one
> tube in the 350C or 500C by using a dummy load of higher than normal
> impedance.  You don't want to operate these old sweep tubes with too high
> an impedance mismatch.
>
> 73,
>
> Maynard
> W6PAP
>


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