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Re: [Amps] power limiting in 8410 amps?

To:, Steve Bookout <>
Subject: Re: [Amps] power limiting in 8410 amps?
From: Russ Williams via Amps <>
Reply-to: Russ Williams <>
Date: Fri, 2 Nov 2018 18:35:30 +0000 (UTC)
List-post: <>
 Steve.  I would thrilled to get 1200 watts out of my L4B with 40 watts drive . 
 I actually know nothing about your amp, but I like to run mine at a fast idle 
rather than full bore.  If that extra 200-300 watts will make the difference in 
your contesting, then that is what you should strive for.  
About 10 years ago, I converted an AM-6155 control tower amp to 144Mhz and 
achieved a true 600 watts out using a GS-36B tube and modded power supply.  It 
ran great---for a while..  

It's all good radio.
Russ KW6T

    On Friday, November 2, 2018, 10:41:49 AM PDT, Steve Bookout 
<> wrote:  
 Hello all,

Over the last week, or so, I seem to remember 'glossing over' messages 
and seeing some comment, by someone, mentioning that 8410 Alpha amps 
have some circuitry that tends to limit their output. This being, done, 
I guess, to get FCC approval.

I ask because, I have 4 of these amps in my M/M contest station and I've 
always noticed that the higher the power out, the more input it takes to 
get there.   They tune up real nice and easy to about 1200 to 1300 
watts, with about 40 watts of drive, but to get to 1500 seemed to be a 
challenge.  Seemed like the gain would fall off, maybe taking twice as 
much power to get the last 200 watts.

Can anyone shed some light on this?

Details would be great, as I would like to maybe remove such limiting 
circuitry.  It just seems like I'm pushing the amp in a bad way to get 
the 1500 watts out.  I know there is no real difference in the effect of 
the power out, but I would rather get 1500 watts out @ 45 watts of 
drive, than 65-70 watts of drive.

73 de Steve, NR4M

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