The TZ-40 is a triode designed for zero bias applications and has a mu of 62 made by Taylor. They came in different base materials and plate cap insulation. The third example was made by Hytron and is marked TZ-40 110E/37 which is a designation for the British CV1076 or VT79 tube.
Length = 6.12" Diameter = 2.00"
Max voltage = 1000
Max current = 115 ma
Fil voltage = 7.5
Fil current = 2.5 amps GOTO INDEX