6S3P

Small Signal Triode — Noval

Known Equivalents & Substitutes

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)180V

Anode Dissipation (max)Anode Dissipation (max)2.2W

Typical Operating

Anode Voltage (typical)Anode Voltage150V

Grid 1 Bias VoltageGrid Voltage-1V

Anode CurrentAnode Current14mA

Anode ResistanceAnode Resistance3,300Ω

TransconductanceTransconductance

Capacitances

Grid-to-Plate CapacitanceGrid-to-Plate Capacitance1.6pF

Input CapacitanceInput Capacitance4.5pF

Output CapacitanceOutput Capacitance1.6pF

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.35A

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

1Anode

2No Connection

3Cathode

References