[Amps] output of SB220 typical TSPA

[R L Measures]

On Jul 17, 2006, at 4:19 PM, Tom W8JI wrote:

>
>> Joe,what was the filament voltage with that kind of line
>> input? Excessive
>> filament voltage allows more than normal emission with
>> thoriated tungsten
>> fils...At least for a while! 73, Jim K7RDX..
>
> Jim,
>
> A single tube will easily make 1200 watts or more  with
> enough drive at 3000 volts, and you don't have to run the
> filament extra hot to do it.

The rated anode current is 400mA max.  3000v x 400mA = 1200W input.  
1200w output seems a bit far fetched, Tom.

> There isn't any doubt at all people are seeing 2kW or more
> from a pair when they bang them with 150 watts or more at
> 3kV or more.
>
> The problem is with claims that a pair in g-g run 1500 watts
> or more out with 100 watts of drive and about 3kV on the
> anode. It really won't happen, even if you put 10 volts on
> the filament. The problem is power gain, and the gain is
> largely set by the ratio of cathode driving impedance to
> anode load impedance in a g-g amp. The only way to get more
> gain is by running more HV so the anode impedance is higher.
>
> 73 Tom
>
>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org