That looks fine to me. Maximum power will be around 1200W with 100W drive so
those tubes have a lot of life left. The low drive efficiency is normal.
Carl
KM1H
----- Original Message -----
From: "budi santoso" <yb1bs@yahoo.co.id>
To: <amps@contesting.com>
Sent: Friday, January 08, 2010 11:37 PM
Subject: [Amps] alpha 76a
> Hi
> I am restoring an alpha 76a 2 tube version, which I got in bad condition.
> After repairing power supply and control circuit I am able to run the
> linear amp.
>
> The working condition for 2 3cx400a are :
>
> Pout Pin Vanode Ianode Igrid Eff.
> watt watt volt mA mA %
>
> 1000 85 2000 720 30 70
> 800 65 2050 600 22 65
> 600 50 2000 520 15 55
> 400 35 2000 400 10 48
>
> Power output and input measured using Bird with 1000w and 250 W slug, I
> think accurate.
> Voltage and current measured using internal meter ( I have no equipment to
> callibrate )
>
> Is the tube condition good enought ?
>
> Thank's
>
> Budi
> YB1BS
>
>
>
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