The GU-81M or ГУ-81М is a 450 watt pentode made in Russia. Length = 9.37" Diameter = 4.00" Max voltage = 3000 Max current = 600 ma Fil voltage = 12.6 Fil current = 11 amps GOTO INDEX
The GU-81M or ГУ-81М is a 450 watt pentode made in Russia.
