Tetrode, used in output stages of low frequency amplifiers.
Envelope: glass, with octal base.
Mass 70 g.

Lead diagram

General characteristics:

Type 6L6G
Filament voltage, Volt 6.3
Anode voltage, Volt 250
1st grid voltage, Volt -14
2nd grid voltage, Volt 250

Type 6L6G
Filament (heater) current, mA 900±90
Anode current, mA 72±18
2nd grid current, mA no more than 9
1st grid reverse current, mkA £ 3
Cathode current, mA no less than 275
Output power, W no less than 5.4
Mutual conductance, mA/V 5.2 to 6.8
Internal resistance, k? 25
Inter electrode capacitance, pF:  
input 11±2
output 8.2±1.5
transfer no more than 1
Operation time, h ³ 1000

Limited operating values:

Filament voltage, V 5,7-7
Anode voltage, V 375
2nd grid voltage, V 300
Cathode - heater voltage, V 100
Cathode current, mA -
Anode dissipation, W 20
2nd grid dissipation, W 2.75
Resistance in 1st grid circuit, k? 500

Operating environmental conditions :

Type 6L6G
Acceleration of vibration loads, g 1.5
by frequencies, Hz 50
Acceleration of multiple impacts, g -
Acceleration of single impact, g -
Continuos acceleration, g -
Ambient temperature, °Ñ -60 to +70
Relative humidity at up to 40°C, % 98

Plate-grid and plate curves