> Face it: a 4-1000A is LOAFING at Amateur Radio power
> limitations --- TWO
> 4-1000A's would loaf along even more under Ham power
> rules...
No.
It is actually at maximum stressed at amateur power limits
in grounded grid class AB2. It really isn't that big or that
good of a tube, we just have rosy colored memories just like
we do of the gas guzzling low performance cars of the era
and acreage consuming antennas that had less gain than a
4-element Yagi from the era when most of us were growing up.
Consider at 60 percent efficiency at 1500 watts output
(legal limit in the USA) a 4-1000A would be running 2500
watts input and dissipating 1000 watts...right at the limit.
Worse yet it would take about 120-150 watts of drive to do
that.
>> I clearly stated "at the limit for Ham Bands." Therefore
>> two tubes
>> does not have an advantage in power. Both circuits can
>> run at maximum
>> legal limit without strain.
Not true. It take a pair of 4-1000A's to run "no strain"
legal limit in grounded grid, and a heap of drive power.
The 4-1000A is old technology that gives us a warm fuzzy
feeling and makes our aged brain cells call for saliva. It
creates memories of big conservative power where there
really was none compared to today when a bottle 1/3 the
physical size does almost everything better except perhaps
warm our hearts with that white-glowing filament and red
glowing anode.
Don't let nostalgia get in the way of fact.
73 Tom
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