The HY51Z is a 65 watt triode with a mu of 85 and full ratings to 60 MHz. Designed by Hytron for zero bias operation.
Length = 6.50" Diameter = 2.25"
Max voltage = 1000
Max current = 175 ma
Fil voltage = 7.5
Fil current = 3.50 amps
Data sheet:
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