[Amps] Swan Mark 1 Resting Plate Current

[Dennis Watkins]

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
>
>__________________________________
>Do you Yahoo!?
>New Yahoo! Photos - easier uploading and sharing.
>http://photos.yahoo.com/
>_______________________________________________
>Amps mailing list
>Amps at contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>
>
>  
>