[ARC5] Why "Noodling" About Sweep Tubes

[wa5jci at flash.net]

The 5894 is used in the Swan 6 and 2 meter transverters as well as 
the Hallicrafters  two transverters. The Swan transverters are a more 
modern design. I ran one for years on 2 meters and the same tube 
would pump out 110 watts key down as long as I used it. The 5894B is 
the best of the lot and is used in the Swan transverters. The 
Motorola version has larger plate posts and has more plate 
dissipation as well as ruggedness..  Back in the good old days I 
sawed off the final compartment of a GE UHF radio. it used the 8072, 
built a power supply and ran it on 432 SSB with a HB transverter.

de Pete WA5JCI





At 10:25 PM 10/23/2013, Scott Johnson wrote:
>The ultimate version of this family is the 8643, more dissipation than the
>5894, designed to be conduction cooled.  Used in the high power versions of
>the Motorola Motrac VHF mobile..  Neither the 5894 or 8643 could be used at
>UHF with full ratings, so most UHF applications used the 8072 cermet tube.
>I have seen all of these tubes last 20 years in repeater service.  BTW, the
>5894 was used in the Collins 17L3 and 17L4 aircraft transmitters.
>
>Scott W7SVJ