8D21

The 8D21 is a 6000 watt, water cooled tetrode with a maximum frequency of 300 MHz. Made by RCA and used in the TT-5A, 5 KW television transmitter.

Length =12.00" Diameter = 5.75"
Max voltage = 6000
Max current = 2 amps
Fil voltage = 4.2
Fil current = 135 amps
Data sheet:

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