Various images of transmitting tubes and the hardware used with them: Amperex 4CX250B, Eimac 4CX250K, and Burle 8791 ceramic-metal vacuum tubes with forced-air-cooled external plate radiator structures. Also datasheets for these tubes.
Two 4CX250B tube sockets with associated components
Two 4CX250B tube sockets with associated components
These were removed from a pair of U.S. Forest Service 150 MHz radios
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The bottom of one of the 4CX250B tube assemblies
The bottom of one of the 4CX250B tube assemblies
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The 4CX250B tube assembly with the shiny tube in it.
The 4CX250B tube assembly with the shiny tube in it.
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The 4CX250B tube assembly with the dark (burnt?) tube in it.
The 4CX250B tube assembly with the dark (burnt?) tube in it.
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The shiny 4CX250B tube.
The shiny 4CX250B tube.
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The shiny 4CX250B tube.
The shiny 4CX250B tube.
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The shiny 4CX250B tube.
The shiny 4CX250B tube.
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The dark 4CX250B tube.
The dark 4CX250B tube.
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The dark 4CX250B tube.
The dark 4CX250B tube.
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The dark 4CX250B tube.
The dark 4CX250B tube.
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The dark 4CX250B tube.
The dark 4CX250B tube.
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An E. F. Johnson 4CX250B airsystem socket.
An E. F. Johnson 4CX250B airsystem socket.
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Datasheet for Eimac 4CX250B/7203 power tube
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Datasheet for Penta Labs 4CX250B/M power tube
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A 4CX250K tube, bottom view.
A 4CX250K tube, bottom view.
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A 4CX250K tube, side view.
A 4CX250K tube, side view.
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A 4CX250K tube, top view.
A 4CX250K tube, top view.
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Datasheet for Eimac 4CX250K/8245 power tube
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Back of Jettron 89-078 socket for 8791 power tube.
Back of Jettron 89-078 socket for 8791 power tube.
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Front of Jettron 89-078 socket for 8791 power tube.
Front of Jettron 89-078 socket for 8791 power tube.
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Front of Jettron 89-078 socket for 8791 power tube.
Front of Jettron 89-078 socket for 8791 power tube.
Top layer (outer ring) is screen grid; next down is control grid; next down is heater/cathode; innermost and lowest is other end of heater.
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Side of Jettron 89-078 socket for 8791 power tube.
Side of Jettron 89-078 socket for 8791 power tube.
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Insulating ceramic spacer (Part #8122) in Jettron 89-078 socket for 8791 power tube.
Insulating ceramic spacer (Part #8122) in Jettron 89-078 socket for 8791 power tube.
Quoted price for 3 is $167.50(!!)
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Bottom of Burle 8791 power tube.
Bottom of Burle 8791 power tube.
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Side of Burle 8791 power tube.
Side of Burle 8791 power tube.
Note the pretty purple ceramic!
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Side of Burle 8791 power tube.
Side of Burle 8791 power tube.1610381 bytes
Top of Burle 8791 power tube.
Top of Burle 8791 power tube.
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Datasheet for Burle (RCA) 8791 power tube
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Datasheet for Burle (RCA) 8791v1 power tube, the new, rather improved version of the original 8791
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