The 203A is a 100 watt triode with a mu of 25. Maximum frequency for full power is 15 MHz. These tubes were produced from 1923 and replaced the UV203A. The first example was made by RCA and the second by Sylvania.
Length = 7.87" Diameter = 2.20"
Max voltage = 1250
Max current = 220
Fil voltage = 10
Fil current = 3.25 amps GOTO INDEX