[AMPS] tuning capacitor & insulator

[John Fielding]

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.

In summary:

4CX250B/BC	anode 250W
		screen 12W
		grid	2W

4CX250R	anode	250W
		screen	12W
		grid	2W

What's the difference?


John	ZS5JF

----------
> From: km1h@juno.com
> To: amps@contesting.com
> Subject: Re: [AMPS] tuning capacitor & insulator
> Date: 18 December 1998 08:27
> 
> 
> 
> 
> On Thu, 17 Dec 1998 16:25:34 -0800 Rich Measures <measures@vc.net>
> writes:
> 
> 
> SNIPPED
> 
> 
> >>No criticism of Rich's particular design; the limitation is in the 
> >tubes
> >>themselves.
> >>
> >€  Did you perhaps presume that the 7580 has the same power capability 
> >as 
> >a 4CX250B?
> 
> Presumption or fact Rich?  Yes the 250R and 7580 ( not exactly the same
> tube either) have somewhat different specs than the 250B ,  but they
> still have identical cathode emission.
> So due to internal design only the R version is a bit more linear but
> still suffers from the same maximums as the 250B.
> I went thru this at length when Collins Engineers introduced the
> AN/URC-32 to the Navy and I was part of the evaluation team ( as a lowly
> tech that did all the real work !) 
> 
> 73  Carl  KM1H
> 
> 
> >>
> >-  later, Ian
> >
> >
> >Rich...
> >
> >R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  
> >
> >
> >--
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> >
> 
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