Screen Dissipation (max)Screen Dissipation (max, Vg2 up to 165V)0.7W
Notes
Remote-cutoff (variable-mu) characteristic: transconductance varies smoothly with grid bias, enabling AGC control without cross-modulation distortion.
Grid No.3 (suppressor) is connected to cathode at the socket — external connection required.
RCA specifies two operating conditions: Va=100V/Vg2=100V (Ia=10.8mA, gm=4.3mA/V) and Va=250V/Vg2=100V (Ia=11mA, gm=4.4mA/V).
Cathode bias resistor Rk=68 Ω for the standard operating point.
Brimar rates Vg2_max at 125 V for the operating condition, while RCA allows Vg2_supply up to 330 V — consult specific manufacturer data for your application.
Vhk_max is 200 V (both polarities, but DC component must not exceed 100 V when heater is positive).
Pin Layout — B7G
1Control Grid (g1)
2Suppressor Grid (g3) + Internal Shield
3Heater
4
Socket-Compatible Tubes ⚠ Not electrically compatible