300B Direct Heated Triode Power tube data

Characteristics

BaseUX-Base (4 pins, 2 thick), A4-72 Medium 4-Pin Bayonet Base
TypeTriode Power Output
FilamentVf = 5 Volts, If = 1.2 Ampere, Direct Specified voltage AC/DC
IdenticalWE300B, 4300A, CV2609
SimilarSlightly Different: PX300B
Different Quality: 300B-98
Predecessor300A

Maximum Ratings

Max Anode Voltage (Pin 2)400 Volts
Max Anode Current100 mA
Max Anode Dissipation36 Watts
Max Circuit Resistance for Fixed Bias0.05 MegaOhm
Max Circuit Resistance for Self Bias0.25 MegaOhm

Pin Layout

PinFunction
1Filament
2Anode
3Grid
4Filament