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[AMPS] Tube rating question

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Subject: [AMPS] Tube rating question
From: (Joe Subich, W8IK/4)
Date: Wed, 24 Feb 1999 09:50:04 -0500

> > 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.

> If the tube was designed for opration at 2500 volts 800 mA, why does the
> data sheet/catalog give 2200 volts 600 mA as "maximum ratings?"  Why not
> simply show the lower "typical operation" numbers like many other tubes
> in the catalog?

My Eimac catalog shows essentially the same tube, the 3CPX800, rated for
3500 volts at 8 amps maximum (short pulse).  I don't have the full data
sheet so I can't make any determination of the average current in that
service but if one assumes a 10% duty cycle, it would support maximums
of 3500 volts at 800 ma in linear operation.

   ... Joe Subich, W8IK/4  ex-AD8I

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