6M6G

Power Pentode — Octal

Mullard

Known Equivalents & Substitutes

EL336M66M6GT6AG6GKT61N147CV2938BVA266PP6BG

Electrical Specifications

Section 1 — Pentode

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)250V

Screen Voltage (max)Screen Voltage (max)275V

Anode Dissipation (max)Anode Dissipation (max)9W

Screen Dissipation (max)Screen Dissipation (max)2.5W

Cathode Current (max)Cathode Current (max)

Section 2 — Triode Strapped

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)250V

Typical Operating

Anode Voltage (typical)Anode Voltage250V

Grid 1 Bias VoltageGrid 1 Bias Voltage-8.5V

Anode CurrentAnode Current20mA

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.9A

Notes

The Mullard datasheet specifies a maximum supply voltage (Va(b1)) of 550 V, but a maximum anode voltage of 250 V. This means the tube can operate in circuits with HT rails up to 550 V provided the actual anode voltage does not exceed 250 V.
KT61 is functionally similar but is a beam tetrode rather than a true pentode; pin-compatible on octal base.
Grid resistor max is 1.0 MOhm (cathode bias). The datasheet also specifies Rh-k max = 5.0 kOhm.
Sams Substitution Handbook lists 6AG6G as a substitute for 6M6G in parallel-filament circuits only.

Pin Layout — Octal

1No Connection (metallisation/shell)

2Heater

3Anode

4

Socket-Compatible Tubes ⚠ Not electrically compatible

References