← Browse Medium quality — at least 60% of universal parameters and pins are present, but some key data is missing. Verify specific values against datasheets before critical use.
Known Equivalents & Substitutes
No known equivalents. If you know of any, use the ⚑ Report Issue button above.
Similar Tubes (Not Drop-In Compatible)
Similar beam tetrode but Octal base with 6.3V heater — different base, different heater requirements Similar beam tetrode class but Octal base and 6.3V heater — different base and heater Electrical Specifications
Absolute Maximum
Anode Voltage (max) Anode Voltage (max) 250V
Screen Voltage (max) Screen Voltage (max) 250V
Anode Dissipation (max) Anode Dissipation (max) 9W
Typical Operating
Anode Voltage (typical) Anode Voltage (typical) 250V
Notes
GE Essential Characteristics confirms: 25V/0.3A heater, Noval (9BQ) base, beam power amplifier, Pa_max=9W, Va_max=250V, Vs_max=250V. GE data: Va=250V, Vs=250V, Vg=5V (cathode bias), Ia=35mA, Is=3.5mA, ra=100k ohms, gm=8500 umhos. Designed for series-string heater circuits in AC/DC consumer receivers where 25V heater segments are used. The 25V/0.3A heater is standard for the 150 mA series-string heater chain used in many AC/DC TV and radio receivers. Pin Layout — Noval
1 2 3 4 5 6 7 8 9
1 Control Grid (g1)
2 Cathode
3 Heater
Socket-Compatible Tubes ⚠ Not electrically compatible