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6SK7 — Small Signal Pentode, Octal | Tubeofile
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6SK7
Small Signal Pentode — Octal
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Known Equivalents & Substitutes
6SK7GT
6SK7W
6SK7WA
CV1981
Similar Tubes (Not Drop-In Compatible)
6BA6
Miniature (B7G) remote-cutoff pentode — similar function but not pin-compatible
6BD6
Miniature (B7G) remote-cutoff pentode with similar electricals — modern replacement but different base
6K7
Brans lists as equivalent — earlier remote-cutoff pentode on Octal base
7B7
Brans lists as equivalent — Loctal base version
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Anode Dissipation (max)
Anode Dissipation (max)
4
W
Screen Voltage (max)
Screen Voltage (max)
150
V
Typical Operating
Anode Voltage (typical)
Anode Voltage (typical)
250
V
Notes
The 6SK7 is one of the most common RF/IF amplifier pentodes in vintage AM receivers. Remote-cutoff characteristic allows smooth AGC action.
GE data: Va max 300V, Vg2 max 150V, Pa max 4W. Typical at Va=250V, Vg2=100V, Vg=-3V: Ia=9.2mA, Ig2=2.6mA, gm=2000 umhos, Rp=800kΩ.
Sams lists 6SK7W as substitute.
Pin Layout — Octal
1
2
3
4
5
6
7
8
1
Shell (Metal type)
2
Heater
3
Anode
4
Socket-Compatible Tubes
⚠ Not electrically compatible
6AC7
References
https://frank.pocnet.net/sheets/049/6/6SK7.pdf
https://tdsl.duncanamps.com/show.php?des=6SK7
Grid 1 Bias Voltage
Grid 1 Bias Voltage
-3
V
Screen Voltage
Screen Voltage (typical)
100
V
Anode Current
Anode Current
9.2
mA
Screen Current
Screen Current
2.6
mA
Anode Resistance
Anode Resistance
800,000
Ω
Transconductance
Transconductance
2
mA/V
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
0.3
A
Grid 2 (Screen)
5
Grid 3 (Suppressor)
6
Cathode
7
Heater
8
Grid 1 (Control Grid)