Yes the 572s will certainly handle more drive. Page 35-8 of the 1994 ARRL
Handbook states that for a pair of 572s operating at 2400 Ep, with an Ip of
500 mA, power out should be ~ 600 watts with 100 watts of drive. I think
this is a bit much on the drive. Generally with a pair of 572s you will
achieve no more output after about 80 watts of drive. eg, each tubes needs
around 40 watts max. for full out.
page 35-8 in the 1994 ARRL Handbook suggests no more than 12 watts of drive
per tube for the 811A with an Ep of 1250 vdc and a max Ip of 175 mA. You
should see around 165 watts out.
Hope this helps.
Lane Zeitler
KM3G
San Diego
John 3:3 <><
-----Original Message-----
From: Doug Person <ki6bq@ibm.net>
To: zeitler@ibm.net <zeitler@ibm.net>; Brian Sarkisian <kg8co@lni.net>;
amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
Date: Wednesday, October 28, 1998 5:34 AM
Subject: Re: [AMPS] AL-811
>So, Lane, the question begs to be asked: If driving the 811a's to 700
watts
>out is going to limit the life of these tubes, dosen't using 572b's offer a
>little more headroom here? Do you think they could handle more drive
>without experiencing shortened life?
>
>Doug -- W4DXV
>
>
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