Paul, does the plate current ever "dip" in approximate correlation to power
output peak? Is there any power output peak??? Your symptoms make me think
something slipped in the bandswitch drive chain or camshaft, and the wrong
components are in the tank (famous Henry problem)! -WB2WIK/6
"Success is the ability to go from failure to failure with no loss of
enthusiasm." -Winston Churchill
> -----Original Message-----
> From: Paul Ash [SMTP:bluesdude@cfl.rr.com]
> Sent: Monday, October 06, 2003 5:55 PM
> To: amps@contesting.com
> Subject: [BULK] - [Amps] Soft 8877???
>
> Hello All,
>
> A quick newbie question.
> I recently picked up an old Henry 3K X
> that had sat unused for the last 17 years.
> This is the version with the 8877.
> This is my first 8877 based amp and I'm seeing
> some odd behavior:
>
> Max power out 700W. (from what I understand
> I should be getting 3X that.)
> Virtually no grid current.
> Plate voltage looks ok, 4000V in SSB 3000V in CW mode. However, the output
> does not change from one plate voltage to another. Just seems to hover
> around
> 500-700W. I have tried driving it to 900mA on the plate
> and 400mA on the plate, observed some difference but
> not much, maybe 25% difference.
>
> Any ideas? At first I thought it might be the tuning circuits but I'm not
> sure. Or, is it the tube? Seems to me that if I can pull 900mA through the
> plate then the tube may not be bad...
>
> 73,
>
> Paul N1PA
>
>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|