Does the output as read on the Bird agree, roughly, with the A87 output
meter?
Bert, fVE3QAA
Bill Aycock wrote:
> Lots of the ordinary things have been checked, but-
>
> Have you checked the Bird?
>
> Bill-W4BSG
>
> At 07:38 PM 5/29/01 -0700, you wrote:
>
> >-
> >Hello there,
> >-
> >A non amps member, Bob W0YVA Emails me with
> >a problem he's having with his just purchased used
> >Alpha A77. Care to take a stab with your opinion of
> >the problem..?
> >-
> >I have directed him to watch the amps archive for
> >your answers. Below is a copy of his text to me...
> >73's-skipp
> >-
> >[snip]
> >: Here is what I have:
> >: This is a "new" A77 (looks like never used) -
> >: Serial 2556.
> >: Seems to be okay except very low power output
> >: (200 watts or so) with 80 watts drive. There is
> >: plenty of grid current. Applying drive results in
> >: significant plate current (800ma or so) which
> >: can be dipped (the dip is very shallow) for
> >: "max" power. HV reads normal. Power is
> >: being measured with Bird wattmeter using
> >: 5KW Bird dummy load. Problem appears on all
> >: band segments.
> >-
> >: Here is what I have done:
> >-
> >: 1. Replaced 8877 with known good tube - no
> >: difference.
> >: 2. Checked bias directly at 8877 socket -
> >: switches properly from high to low with
> >: drive applied.
> >: 3. The zener, D13, seems okay - checked
> >: with ohmmeter.
> >-
> >: Where is the power going with all that plate
> >: current? Weird.
> >-
> >: Suggestions for what to check? The plate
> >: tank components all look good - no evidence
> >: of heat anywhere.
> >-
> >: Any help would be appreciated.
> >-
> >: 73, Bob
> >: W0YVA
> >
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> >--
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> >
> >
> -
> Bill Aycock --- Persimmon Hill
> Woodville, Alabama, US 35776
> (in the N.E. corner of the State)
> W4BSG -- Grid EM64vr
> baycock@HiWAAY.net
> w4bsg@arrl.net
>
> --
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--
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