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6S2S — Small Signal Triode, Octal | Tubeofile | Tubeofile
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6S2S
Small Signal Triode — Octal
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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.
↗ Radiomuseum
Known Equivalents & Substitutes
6J5
6J5GT
6J5G
CV1067
VT-94
L63
Similar Tubes (Not Drop-In Compatible)
12J5GT
12.6V heater version of 6J5GT — same electricals but incompatible heater
6S5S
Soviet equivalent of 6C5GT — similar single triode but different mu/gm characteristics
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Anode Dissipation (max)
Anode Dissipation (max)
2.5
W
Cathode Current (max)
Cathode Current (max)
20
mA
Heater-to-Cathode Voltage (max)
Heater-to-Cathode Voltage (max)
90
V
Typical Operating
Notes
Cyrillic designation: 6С2С. The Latin transliteration 6S2S uses 'S' for Cyrillic 'С'.
Russian_equivalents.json confirms: 6S2S ≈ 6J5GT. Foreign_substitutes.json also lists 6S2S with western analogue 6J5GT.
Electrically identical to the 6J5GT: mu=20, gm=2600 µmhos, ra=7700Ω at Va=250V, Vg=-8V.
Same Octal pinout as 6J5GT — pin-compatible drop-in replacement.
Pin Layout — Octal
1
2
3
4
5
6
7
8
1
Shell / No Connection
2
Heater
3
Anode
4
Socket-Compatible Tubes
⚠ Not electrically compatible
12AV5
12AX4
12DQ6
12E1
12J5
12J5GT
12W6GT
1H4
25L6GT
350B
367A
5881
5C4S
5CU4
6550
References
https://frank.pocnet.net/sheets/127/6/6J5.pdf
https://www.radiomuseum.org/tubes/tube_6s2s.html
Anode Voltage (typical)
Anode Voltage
250
V
Grid 1 Bias Voltage
Grid Voltage
-8
V
Anode Current
Anode Current
9
mA
Anode Resistance
Anode Resistance
7,700
Ω
Transconductance
Transconductance
2.6
mA/V
Amplification Factor (μ)
Amplification Factor (μ)
20
—
Capacitances
Grid-to-Plate Capacitance
Grid-to-Plate Capacitance
3.4
pF
Grid-to-Cathode Capacitance
Grid-to-Cathode Capacitance
3.4
pF
Anode-to-Cathode Capacitance
Anode-to-Cathode Capacitance
3.6
pF
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
0.3
A
No Connection
5
Grid
6
No Connection
7
Heater
8
Cathode
6A5G
6B4G
6C2C
6CD6G
6EN4
6F5
6F6
6F6S
6F8G
6K6
6L6
6L6GC
6M6G
6N3C
6N7
6P3P
6P5GT
6P6S
6S41S
6V6
6W6
6Y6
7027A
7581
AZ31
CV1135
ECC31
EL32
EL34
EL37
EL38
EL39
GZ30
GZ31
KT120
KT150
KT170
KT63
KT66
KT77
KT88
KT90
PL38
UU6