The PR-4-B is a 250 watt triode with a mu of 23. Maximum frequency for full power is 3 MHz. These brass based tubes were made by GE. The version made for RCA was the UV204A.
Length = 14.38" Diameter = 3.75"
Max voltage = 3000
Max current = 275 ma
Fil voltage = 11
Fil current = 3.85 amps GOTO INDEX