The HY40 is a 40 watt general purpose triode with a mu of 25. Made by Hytron it has maximum ratings to 60 MHz.
Length = 6.25" Diameter = 2.25"
Max voltage = 1000 VDC
Max current = 125 ma
Fil voltage = 7.5 volts
Fil current = 2.25 amps
Data sheet:
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