The RK-57 is a 125 watt zero bias triode with a mu of 100 made by Raytheon. The RK-57 is the same tube as the 805. Length = 8.50" Diameter = 2.31" Max voltage = 1500 Max current = 210 ma Fil voltage = 10 Fil current = 3.25 amps GOTO INDEX
The RK-57 is a 125 watt zero bias triode with a mu of 100 made by Raytheon. The RK-57 is the same tube as the 805.