The CV2131 or QB3.5/750 is a 250 watt tetrode made by Mullard. Very similar to the 4-250A tubes. Length = 5.75" Diameter = 3.18" Max voltage = 4000 Max current = 350 ma Fil voltage = 5 Fil current = 14.1 amps GOTO INDEX
The CV2131 or QB3.5/750 is a 250 watt tetrode made by Mullard. Very similar to the 4-250A tubes.