4BZ8 — Small Signal Triode, Noval | Tubeofile← BrowseData: HighHigh quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.
Known Equivalents & Substitutes
No known equivalents. If you know of any, use the ⚑ Report Issue button above.
Similar Tubes (Not Drop-In Compatible)
Brans lists as equivalent — verify pin compatibility 6BZ8
Identical electrically but with 6.3 V heater — different heater voltageElectrical Specifications
Absolute Maximum
Anode Voltage (max)Anode Voltage (max)250V
Anode Dissipation (max)Anode Dissipation (max)2.2W
Typical Operating
Anode Voltage (typical)Anode Voltage (typical)150V
Anode CurrentAnode Current9mA
Notes
- 4.2 V / 600 mA heater — designed for parallel heater operation from a 4.2 V supply.
- The two triode sections have dissimilar characteristics, optimized for cascode RF amplifier operation.
- GE Essential Characteristics lists: Pa_max 2.2 W, Va_max 250 V, gm 6200 µmhos, ra 5300 Ω, mu ~33.
Pin Layout — Noval
1Anode (Unit 1)
2Grid (Unit 1)
3Cathode (Unit 1)
Anode ResistanceAnode Resistance
5,300Ω
TransconductanceTransconductance6.2mA/V
Amplification Factor (μ)Amplification Factor (μ)33—
Absolute Maximum
Anode Voltage (max)Anode Voltage (max)250V
Anode Dissipation (max)Anode Dissipation (max)2.2W
Heater
Heater VoltageHeater Voltage4.2V
Heater CurrentHeater Current0.6A