6P43P — Power Pentode, Noval | Tubeofile

6P43P

Power Pentode — Noval

Reflector

Known Equivalents & Substitutes

EL866CW5CV5094

Similar Tubes (Not Drop-In Compatible)

6P33P

Soviet equivalent of EL86/6CW5 — closer match than 6P43P to the EL86 specification, same Noval pinout

Electrical Specifications

Section 1 — Pentode

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)300V

Screen Voltage (max)Screen Voltage (max)250V

Anode Dissipation (max)Anode Dissipation (max)12W

Screen Dissipation (max)Screen Dissipation (max)2W

Cathode Current (max)Cathode Current (max)75mA

Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)100V

Max Grid ResistorMax Grid Resistor2.2MΩ

Typical Operating

Anode Voltage (typical)Anode Voltage185V

Screen Voltage (typical)Screen Voltage185V

Grid 1 Bias VoltageGrid 1 Bias Voltage-16.2V

Anode CurrentAnode Current45mA

Screen CurrentScreen Current

Section 2 — Triode Strapped

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)200V

Anode Dissipation (max)Anode Dissipation (max)12W

Cathode Current (max)Cathode Current (max)100mA

Typical Operating

Anode ResistanceAnode Resistance1,000Ω

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.625A

Notes

Cyrillic designation: 6П43П (6P43P), 6П43П-Е (6P43P-E).
The 6P43P shares the same pinout as EL84/6BQ5 but is NOT a direct EL84 substitute — it has lower maximum screen voltage (250V vs 300V) and different operating characteristics. It is closer to the EL86/6CW5.
The suppressor grid (g3) is internally connected to the cathode at pin 3.
Internal resistance (ra) in pentode mode is not stated in the Soviet datasheet. The EL86 ra ≈ 26 kΩ (from Philips) may be used as a reference, though the 6P43P is not an exact EL86 equivalent.
Output power (Pout) and load impedance (rl) are not specified in the Soviet datasheet. The tube was designed primarily for TV vertical deflection output, not audio; audio output power is typically 3–5 W single-ended at 185V, based on community experience with this tube.
Triode-strapped data sourced from Tom Schlangen, 'Overview of pentodes / BPTs strapped as triodes' (September 2009), for the EL86 entry. The 6P43P is expected to behave similarly in triode mode.
Rg_max of 2.2 MΩ applies to self-bias (cathode resistor) operation.

Pin Layout — Noval

1Internal Connection

2Control Grid

3Cathode (g3 internally connected)

Socket-Compatible Tubes ⚠ Not electrically compatible

References