6AH6 — Small Signal Pentode, B7G | Tubeofile | 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
6F36CV2521
Similar Tubes (Not Drop-In Compatible)
Brans lists as equivalent but 6AC7 is Octal base — not pin-compatible Similar sharp-cutoff pentode on B7G base but lower gm (5100 vs 9000 umhos) — different gain class European designation for similar sharp-cutoff RF pentode but different pinout Electrical Specifications
Absolute Maximum
Anode Voltage (max)Anode Voltage (max)300V
Screen Voltage (max)Screen Voltage (max)250V
Anode Dissipation (max)Anode Dissipation (max)3.2W
Screen Dissipation (max)Screen Dissipation (max)1.4W
Heater-to-Cathode Voltage (max)
Notes
- Very high transconductance (9000 umhos) makes this tube ideal for wide-band video amplifiers and cascode RF stages.
- GE Essential Characteristics: Pa_max 3.2 W, Va_max 300 V, Vs_max 250 V, Va(typ) 250 V, Vs(typ) 150 V, Vg=-2V, Ia=10mA, Rp=10000, gm=9000.
- Sams substitution guide lists 6F36 and 10C14 as substitutes.
- Sharp-cutoff characteristic — not suitable for AGC-controlled stages (use remote-cutoff types like 6BA6 instead).
Pin Layout — B7G
1Anode
2Screen Grid (g2)
3Heater
4
Socket-Compatible Tubes ⚠ Not electrically compatible
Heater-to-Cathode Voltage (max)
100V
Typical Operating
Anode Voltage (typical)Anode Voltage (typical)250V
Screen Voltage (typical)Screen Voltage (typical)150V
Grid 1 Bias VoltageGrid 1 Bias Voltage-2V
Anode CurrentAnode Current10mA
Anode ResistanceAnode Resistance10,000Ω
TransconductanceTransconductance9mA/V
Capacitances
Grid-to-Plate CapacitanceGrid-to-Plate Capacitance0.025pF
Input CapacitanceInput Capacitance6.5pF
Output CapacitanceOutput Capacitance2.8pF
Heater
Heater VoltageHeater Voltage6.3V
Heater CurrentHeater Current0.45A
Heater