[Boatanchors] Tube crossreference on line? 8643, 8072

[Rod Hogg]

Art..

Lucky find..

In my business, 8643 used as final amp in highband highpower VHF
mobile units, Motorola and others.  It is a beefed up 5894A, has 
larger anode pins however.

The 8072 used in Motorola, GE and EF Johnson/Comco base stations,
UHF mainly, 90Watts continous output,(with proper heat sink and 
cooling) also GE used them in UHF Mastr Pro series mobiles too.  

It has a tricky problem, depending on manufacture of tube.  Grid
capacitance is critical and will oscillate realy easy if not properly
compensated.  RCA different than Amprex and Eimac by quite a bunch.

8072 is a real expensive tube if procured in commercial channels.

Rod K0EQH
REVCOM