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Re: [Amps] Amp output power

Subject: Re: [Amps] Amp output power
From: "Roger (K8RI)" <>
Date: Sun, 23 Aug 2015 15:56:24 -0400
List-post: <">>
With 2400 watts dissipation, (3 tubes) at 62% I get almost 3,900 watts out continuous.

The newer data sheet lists a max of 3,500 volts with a typical operating voltage of 3200 volts.

23 watts drive gives 900 W out @ 3200 VDC so X 3 gives ~70W drive for 2700 out. As the older data sheets listed a higher max voltage (I don't have the curves available). As a SWAG at 3500 VDC, I'd say you'd likely get a peak out of 3 KW @ 80 W drive.

Most of the drive power ends up in the output, but It looks like with SSB you "might" get away with voice peaks at 80W which would likely give somewhere around 1200W peak out (using pulse tuning), but this is in the realm of where even a tiny misstep will destroy the tube. I think you'd be pushing your luck at 80W drive, let alone, 100W


Roger  (K8RI)

On 8/23/2015 10:13 AM, Kevin Stover wrote:
Going through the CPII datasheet for the 3CPX800 we see max plate voltage of 4500V so the tubes will handle the voltage. The tube still has the dainty 4W max dissipation grid so if you hit it with 3600V and 100W you'll probably roast the tubes.

The non-pulse rated 3cx800 max ratings are 2250V plate voltage, 0.6 plate amps. Typical operation at 2200V and 0.5A with 23W of drive will get you 750W AB2 output.

Command Technologies used to build a three hole 3cx800 amp for "export only".

On 8/22/2015 10:46 AM, Chris Fox wrote:
Trying to get a fairly accurate estimate on what the output would be from a
amp with...
3600 plate volts
3  - 3cxp800
100 watts drive

can anyone help with the formula.
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