6F6S is Output pentode.
Russian output pentode 6F6S (6Ф6С) is quality equivalent of the 6F6G 6F6GT 6F6 KT63 N63
Tube is tested with professional tube Tester L3-3. 100 % in norm.
Vf = 6.3 V, Va = 250 V, Vg1 = -14 V, Vg2 = 250 V, Ia = (58 - 86) mA.
Designed to amplify low frequency power in the output single-stroke and two-stroke circuits of bass amplifiers.
The 6F6S pentode is used in sound reproducing, receiving equipment and other general-purpose radio engineering devices.
Cathode oxide of indirect filament.
Works in any position.
Available in glass design.
The plinth is 6-pin octal with a key.
Overall dimensions of the pentode 6F6S:
- lamp height - 83 mm;
- lamp diameter - 33 mm.
Operating time at least 500 h.
Foreign analogue of the lamp 6F6C: 6F6G, 6F6GT, KT63, N63, 1621, 1611.
Decoding of the marking of the pentode:
6F6S
6 - a number indicating the rounded value of the filament voltage of the lamp in volts;
F is the letter defining the type of lamp: F is the pentode triode;
6 is the number of serial number of the development of this type of lamp;
C is a letter characterizing the design: C is a lamp in a glass shell, with or without a plinth, with a cylinder diameter of more than 22.5 mm.
Technical characteristics and electrical parameters of the lamp 6F6S:
• Filament voltage, V: 6.3
• Filament current, mA: 700
• Voltage at the anode, V: 250
• Voltage on the second grid, V: 250
• Displacement voltage on the first grid, V: -16.5
• Current in the anode circuit, mA: 34
• Current in the circuit of the second grid, mA: 7
• Steepness of characteristics, mA/V: 2.5
• Internal resistance, kOhm: 78
• Load resistance, kΩ: 7
• Output power, W: 3.2
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