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6AG5 — Sharp Cutoff Pentode, B7G | Tubeofile | Tubeofile
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6AG5
Sharp Cutoff Pentode — B7G — RCA
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Data: High
High quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.
↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
6AG5WA
6186
EF96
CV2280
Similar Tubes (Not Drop-In Compatible)
6BC5
Similar sharp-cutoff pentode on B7G base but higher Gm (4700 vs 5000 umhos) — not identical operating points
6CE5
Similar sharp-cutoff pentode on B7G base — different operating points
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Screen Voltage (max)
Screen Voltage (max)
300
V
Anode Dissipation (max)
Anode Dissipation (max)
2
W
Heater-to-Cathode Voltage (max)
Heater-Cathode Voltage (max)
90
V
Typical Operating
Notes
The 6AG5 was widely used in early television receivers as an RF amplifier and IF amplifier. The 6186/6AG5-WA is the ruggedised military version.
In pentode connection: at Va=250V, Vg2=150V, Vg1=-5.5V, Ia=5.5mA, Rp=10kΩ (approx), Gm=3800 umhos. At Va=100V, Vg2=100V, Ia=4.5mA, Gm=4500 umhos.
In triode connection (g2 tied to plate): at Va=180V, Rk=330Ω, Rp=8000Ω (approx), mu=45, Gm=5700 umhos. At Va=250V, Rk=820Ω, Rp=8000Ω (approx), mu=42, Gm=3800 umhos.
Capacitances vary depending on presence of external shield (pin 7). With external shield: Cgp=0.020 max pF. Without shield: Cgp=0.030 max pF.
Pin Layout — B7G
1
2
3
4
5
6
7
1
Control Grid (g1)
2
Cathode
3
Heater
4
Socket-Compatible Tubes
⚠ Not electrically compatible
6AF4
6AK5
6BJ6
6CG6
EF95
References
https://frank.pocnet.net/sheets/049/6/6AG5.pdf
https://tdsl.duncanamps.com/show.php?des=6AG5
Anode Voltage (typical)
Anode Voltage (typical)
250
V
Screen Voltage (typical)
Screen Voltage (typical)
150
V
Grid 1 Bias Voltage
Grid Voltage
-5.5
V
Anode Current
Anode Current
5.5
mA
Anode Resistance
Anode Resistance
10,000
Ω
Transconductance
Transconductance
5
mA/V
Capacitances
Grid-to-Plate Capacitance
Grid-to-Plate Capacitance
0.03
pF
Grid-to-Cathode Capacitance
Grid-to-Cathode + Heater Capacitance
6.5
pF
Anode-to-Cathode Capacitance
Plate-to-Cathode + Heater Capacitance
1.8
pF
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
0.3
A
Heater
5
Plate
6
Screen Grid (g2)
7
Cathode
,
Internal Shield