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Re: [Amps] Tube Amps and AM

To: Steve Wright <>
Subject: Re: [Amps] Tube Amps and AM
Date: Tue, 24 Nov 2015 15:26:06 -0500
List-post: <">>

Hi Guys, 

I was advised many moons ago that a tube-type (NOT class "C"!) linear
amplifier could be run as an AM linear, provided you LIMITED THE STEADY

Case in point: I ran my two paralleled 813's at 125 watts of carrier
output back some 20+ years ago---with two 813s, I had a combined plate
dissipation of 250 watts. About 10 - 12 watts of modulated AM carrier
was about right to drive it. 

~73~ de Eddy VE3CUI - VE3XZ 

On 2015-11-23 13:48, Steve Wright wrote: 

> On 24/11/15 06:00, Ray, W4BYG" <> wrote:
>> I have never tried it on AM, but I would suspect you would have to keep the 
>> output power somewhat below about 25% of what it is rated for (about 125 
>> watts or so), if you were going to try it on AM. That would likely require 
>> input drive around 12 watts from your exciter. If you try it, initially be 
>> real sensitive of the heat build up while operating, especially if [snip]
> I have a TL-922A and I run a TS-2000 into on AM - all knobs to the right on 
> 40M!
> I'm not joking at all! Power - full. Mic gain - full. Processor - on.
> Say what you like, but on the air it sounds fantastic, as long as you don't 
> yell into it or else it gets a little overbearing, but never an ounce of 
> splatter. I also use the DSP modifier, and I get all sorts of comments about 
> my whopper AM signal.
> The amp runs in SSB mode (full HT) and the tubes run just-glowing, like they 
> would be on SSB with 100W drive. I can key down as long as I like, and the 
> amp sits on about 400W carrier and PEP is god knows what, but the power meter 
> is swinging pretty hard on voice peaks.
> Using a Tube Amp on AM is totally a blast!
> Steve
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