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6S3P — Small Signal Triode, Noval | Tubeofile
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6S3P
Small Signal Triode — Noval
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↗ Radiomuseum
Known Equivalents & Substitutes
EC86
6CM4
Similar Tubes (Not Drop-In Compatible)
6S4P
Higher-frequency variant — also listed as a substitute for EC86/EC88 in Soviet references
EC88
Philips UHF triode — Soviet 6S4P is listed as substitute but 6S3P is closer to EC86
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
180
V
Anode Dissipation (max)
Anode Dissipation (max)
2.2
W
Typical Operating
Anode Voltage (typical)
Anode Voltage
150
V
Grid 1 Bias Voltage
Grid Voltage
-1
V
Anode Current
Anode Current
14
mA
Anode Resistance
Anode Resistance
3,300
Ω
Transconductance
Transconductance
Capacitances
Grid-to-Plate Capacitance
Grid-to-Plate Capacitance
1.6
pF
Input Capacitance
Input Capacitance
4.5
pF
Output Capacitance
Output Capacitance
1.6
pF
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
0.35
A
Notes
Cyrillic designation: 6С3П. Foreign_substitutes.json confirms: EC86 → 6S3P, 6S4P.
Designed for VHF/UHF front-end stages, particularly grounded-grid RF amplifiers in FM/TV receivers.
Frame-grid construction gives very high transconductance (up to 15 mA/V) for a small-signal triode.
Internal shield connected to pin 9 provides inter-element shielding at UHF frequencies.
Pin Layout — Noval
1
2
3
4
5
6
7
8
9
1
Anode
2
No Connection
3
Cathode
References
https://www.radiomuseum.org/tubes/tube_6s3p.html
15
mA/V
Amplification Factor (μ)
Amplification Factor (μ)
50
—
4
Heater
5
Heater
6
No Connection
7
Grid
8
Cathode
9
Internal Shield