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Re: [Amps] 811A vs. 811H amp power output questions

To: "Mike & Becca Krzystyniak" <>
Subject: Re: [Amps] 811A vs. 811H amp power output questions
From: "Hsu" <>
Date: Sat, 22 May 2010 23:57:50 +0800
List-post: <">>
Even you paraller one hundred 811As, the power gain is same as a single 811A!
----- Original Message ----- 
From: "Mike & Becca Krzystyniak" <>
To: <>
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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