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6F5P — Triode-Pentode, Noval | Tubeofile | Tubeofile
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6F5P
Triode-Pentode — Noval
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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
ECL85
6GV8
Similar Tubes (Not Drop-In Compatible)
6F3P
Soviet ECL82/6BM8 equivalent — similar triode-pentode concept but different characteristics
6GW8
ECL86 equivalent — similar concept but different electrical characteristics
ECL86
Later triode-pentode (6GW8) — higher pentode output, different pinout
Electrical Specifications
Section 1 — Triode
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Anode Dissipation (max)
Anode Dissipation (max)
2
W
Typical Operating
Anode Voltage (typical)
Anode Voltage
200
V
Grid 1 Bias Voltage
Grid Voltage
-1
Notes
Cyrillic designation: 6Ф5П. Russian_equivalents.json confirms: 6F5P ≈ 6GV8, ECL85.
Foreign_substitutes.json also confirms: ECL86 → 6F5P (noting ECL86/6GW8 as Western substitute).
The triode section provides voltage gain, and the pentode section provides power output — a complete audio amplifier in one envelope.
Commonly used in Soviet television audio output stages and compact radio receivers.
The ECL85 was designed for relatively low supply voltages (~200V B+).
Pin Layout — Noval
1
2
3
4
5
6
7
8
9
1
Pentode Anode
2
Pentode Screen Grid
3
Pentode Control Grid
Socket-Compatible Tubes
⚠ Not electrically compatible
AL860
References
https://www.radiomuseum.org/tubes/tube_6f5p.html
V
Anode Current
Anode Current
10
mA
Anode Resistance
Anode Resistance
7,800
Ω
Transconductance
Transconductance
6
mA/V
Amplification Factor (μ)
Amplification Factor (μ)
47
—
Section 2 — Pentode
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Screen Voltage (max)
Screen Voltage (max)
300
V
Anode Dissipation (max)
Anode Dissipation (max)
9
W
Screen Dissipation (max)
Screen Dissipation (max)
2
W
Typical Operating
Anode Voltage (typical)
Anode Voltage
200
V
Screen Voltage (typical)
Screen Voltage
200
V
Grid 1 Bias Voltage
Grid 1 Bias Voltage
-7.5
V
Anode Current
Anode Current
40
mA
Screen Current
Screen Current
6
mA
Transconductance
Transconductance
10
mA/V
Output
Output Power
Output Power
3.4
W
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
0.76
A
4
Heater
5
Heater
6
Triode Anode
7
Triode Grid
8
Cathode (common)
9
Pentode Suppressor / Internal Shield