Electron Gun Cathode Heater Assembly
Tungsten filament heater coil assembly that thermionically emits electrons from cathode in CRT electron guns. Oxide-coated for longevity. 8540.91.50.00 classification.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for non-CRT vacuum tubes
Heaters for other thermionic tubes classify under resistor-fixed carbon types.
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Import Tips & Compliance
• Specify filament voltage (6.3V typical); include life testing data; distinguish from generic vacuum tube heaters
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