[AMPS] Tube rating question

[Terry Gaiser]

I have a copy of the first data sheet Eimac published for the tube just
prior to the new FCC power limit ruling.
Terry W6RU

Jim wrote:
> 
> Is this true ??  Where did you get the info Terry ??
> 
> 73 and thanks
> Jim W7RY
> 
> -----Original Message-----
> From: Terry Gaiser <w6ru@lightspeed.net>
> To: rakefet@rakefet.com <rakefet@rakefet.com>
> Cc: Amps reflector <amps@contesting.com>
> Date: Wednesday, February 24, 1999 12:24 AM
> Subject: Re: [AMPS] Tube rating question
> 
> >
> >The Eimac data sheet for the 3CX800A7 was an after thought. The tube had
> >been developed and rated at 1370 watts output with "typical" operation
> >at 2500 volts at 800 ma. THEN the FCC changed the power limits to 1500
> >watts OUTPUT and Eimac then changes the ratings on the tube for 2200
> >volts at 500 ma. operation and 750 watts output which is what the
> >technical data sheets show.
> >Terry W6RU
> >
> >Vic Rosenthal wrote:
> >>
> >> Eimac's data sheet says that the 3CX800A7 has a plate dissipation of 800
> watts.
> >> But then they say that it '...will deliver 750 watts PEP and 750 watts
> keydown
> >> CW output to 350 mHz'.
> >>
> >> I don't think they're talking about class A, are they?  If an amplifier
> were 65%
> >> efficient, I would expect to be able to get around 1200 watts from this
> much
> >> plate disssipation.  What am I missing here?
> >>
> >> 73,
> >> Vic, K2VCO
> >> Fresno CA
> >>
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