3-500 Z, ZG, C
The tube first started out as the 3-400Z. The original grounded grid triode
introduced in the early 60's. Pwr dissipation 400w.
3-500z-later version of the 400z, having larger fins for increased power
dissipation of 500w.
slightly larger body.requires heat dissipation connector.
3-500zg- Graphite anode version of 3-500z. dissipation of abt 600w.
Graphite provides a more rugged tube. it is produced by Eimac(no
longer)...... Amperex(3-500z/8802),
RF Parts, Inc.
3-500C- Chinese Graphite Tube-made by Penta, Jolida, Star, Pride,
etc.-Quality and warranty vary.
3-600Z Proposed Russia Tube. only prototypes were produced. dont expect
until 1999.
Rf Parts gives 1 to 2 year warranties on their tubes.
The graphite tubes can take a little more overload vs. the regular tubes.
The graphite tubes,
were discovered sometime before WWII. Before use I guess they require, some
sort of burn in, from what I read. A minimum of 10 hours of just filament
burn....not key down, where another source said they required 50-100 hours
of key down before they would produce full pwr. Maybe someone will
enlighten me on that procedure.
I got some of this info from www.rfparts.com and some from stuff people
sent me.
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