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

[Mike & Becca Krzystyniak]

That may be true, but in my opinion the tubes spec gain of 13 dB, 65 watts
should have driven the 811H amp to at least the same output power as the
811A amp.  And I would think with 4 tubes the max Power Out would have
increase to maybe 800-900 watts, versus the 700 watts from the three tube
811A amp.



-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Hsu
Sent: Saturday, May 22, 2010 10:58 AM
To: Mike & Becca Krzystyniak
Cc: amps at contesting.com
Subject: Re: [Amps] 811A vs. 811H amp power output questions

Even you paraller one hundred 811As, the power gain is same as a single
811A!
----- Original Message ----- 
From: "Mike & Becca Krzystyniak" <k9mk at flash.net>
To: <amps at 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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