Even you paraller one hundred 811As, the power gain is same as a single 811A!
----- Original Message -----
From: "Mike & Becca Krzystyniak" <k9mk@flash.net>
To: <amps@contesting.com>
Sent: Saturday, May 22, 2010 11:41 PM
Subject: [Amps] 811A vs. 811H amp power output questions
>
> A friend has a Ameritron 811A amp. Claims it puts out ~700+ watts into a
> DL. Recently he bought a pristine Ameritron 811H amp. But surprisingly it
> only puts out ~600 watts. He drops in 4 new tubes and it still only puts
> out ~600 watts. Both amps were being driven at ~65 watts from an Icom
> 756Pro3
>
> I looked at the schematics, and aside from the extra tube and the plate
> blocking cap being doubled up, I really do not see any other changes. I
> sorta expected the tank "L" values to be changed slightly but that is hard
> to tell from the on line documentation.
>
> Anyone seen this problem before? Aside from recycling the amp is there
> any hope?
>
> Thanks
>
> 73's Mike K9MK
>
>
>
>
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