Re: [Amps] Swan Mark 1 Resting Plate Current

[Dennis Watkins <andromeda@seanet.com>]

Sounds like a couple of things to me.  I'd check the
fil volts at the socket.  Next you should see what
the bias voltage is doing..

Bill Smith wrote:

> I replaced the transformer in my Swan Mark 1 with a
> new one built by Heyboer transformers.  I had them
> increase the wire gauge in the HV and Filament
> windings by one size.  Other than that it is the same.
> The amp has a voltage doubler in it with about
> 1500vdc keyed in the CW mode and about 2500vdc keyed
> in the SSB mode.  I noticed I now have a higher plate
> current than I had before(this is a zero bias amp
> using two 3-400Z tubes in grounded grid).
> Resting Plate Current Before:
> 80ma at 1500vdc
> 180ma at 2500vdc
>
> Now it is:
> 200ma at 1500vdc
> 400ma at 2500vdc
>
>
> The plate voltage is the same as it was before.  Do I
> now need bias?
>
> By the way with the old transfomer I got 1000 watts
> key down now I get 1300 watts key down.
> 73,
> Bill
>
>
> =====
> Bill Smith KO4NR
>
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