[Amps] 3CX1000A7 and larger

[Steve Thompson]

I work at John's (pre-) driver levels, but have just completed 
20kW pulse amps for 214MHz. The output stage is 24 x Freescale 
MOSFETs, each running 4W in, just under 1kW out, which is pretty 
remarkable. If you can find a way to keep them cool, the apps guys 
tell me you can push 800W cw from one. At $400 each, I'd be 
nervous trying.

Steve

> Do you mean no commercial amateur amplifiers? Today I tested my new tetrode 
> amplifier to 735 kW peak with 1 mS long pulses, 60 per second. Average power 
> was about 45 kW, at 198 MHz. That's VHF. 
> Its only 2 tubes, a driver and final. Everything is turned back right now, 
> still doing high voltage testing before shoveling on the duty factor to raise 
> the average (CW equivalent) power. 
> Have had plenty of birthing pains the past month, screen supplies that went 
> south, filament supply that wouldn't cooperate, parasites that wouldn't shut 
> up.... I haven't had much time to pay attention 
> to whats on this forum.  But everything is working better, and this is what it 
> takes to bring up a new rig of this size. 
> 
> John 
> K5PRO
> 
> 
> 
> 
> 
> 
>> Date: Tue, 16 Nov 2010 14:38:19 -0600
>> From: "Its from KE4VYN" <ke4vyn at msn.com>
>> Subject: Re: [Amps] 3CX1000A7
>> To: <amps at contesting.com>
>> Message-ID: <SNT104-DS226D5881283CE27BD6276E9E370 at phx.gbl>
>> Content-Type: text/plain;     charset="iso-8859-1"
>> 
>> To bad there is no one building large VHF amps.
>