Description

This high quality beam tetrode tubes used in output stages of low frequency amplifiers.

The 6P3S output beam tetrode are miniature devices enclosed in glass bulb and are provided with a octal (8-pin) base, rigit leads and an indirectly heated oxide-coated cathode.

Best Quality, the Sound is nice - authentic vintage tone. Long-life no less than 5000 hrs.

All tubes new, military equipment and have "OTK" mark. Near equivalent: 6L6, 6L6GT, 6L6GC and 5881.
The tube is manufactured by the Reflector, Saratov, Russia in 197x. Very rare and old tube. Great sound.

Rare version with double mica holders.

General characteristics:
Type: 6P3S
Filament voltage, Volt: 6.3
Anode voltage, Volt: 250
1st grid voltage, Volt: -14
2nd grid voltage, Volt: 250
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, kΩ: 25
Inter electrode capacitance, pF:
- input: 11±2
- output: 8.2±1.5
- transfer: no more than 1
Operation time over, h: 4000

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, kΩ: 500

Operating environmental conditions :
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, °С: -60 to +70
Relative humidity at up to 40°C, %: 98

All datasheets here.