[Amps] alpha 76a

[Carl]

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 at yahoo.co.id>
To: <amps at 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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