[AMPS] tuning capacitor & insulator

[Rich Measures]

>
>According to my Eimac shortform the 4CX250R and the 7580W are the same
>tube.  BTW the R stands for "ruggedised" it can withstand a lot more
>vibration and shock than a standard 250.  However the plate, screen and
>grid dissipation are the same as a normal 250 and have the same typical
>output power.  Eimac catalog for the 4CX250B/7203 & the 4CX250BC/8957 both
>give typical output power of 300W at 175 MHz in AB1 operation.
>
However,  "Typical" is typically not maximal.  

>In summary:
>
>4CX250B/BC	anode 250W
>		screen 12W
>		grid	2W
>
>4CX250R	anode	250W
>		screen	12W
>		grid	2W
>
>What's the difference?

25% higher screen potential and c.40% higher peak anode current -- but 
only for SSB service.  .   

-  later, John


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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