Product details
New 6N21B dual mini triodes.
New old stock in excellent condition.
Two tubes in one lot.
Double triode to amplify low frequency voltage.
Weight 4.5 g.
6N21B tube parameters:
(each triode)
Filament voltage 6.3V
Anode voltage 300V
Cathode resistance for automatic bias 330 ohms
Filament current 395 ±35mA
Anode current 3.5 ±1.3mA
Anode current difference <1.5mA
Characteristic slope 3.8 ±1.2mA/V
Characteristic slope at Un=5.7V >2.7mA/V
Gain 82 ±18
Leakage current cathode-heater <20 µA
Reverse grid current (Uc=-1.5V) <0.2 µA
Vibration noise voltage <15mV
Input capacitance 2.7±0.75pF
Output capacitance 0.6±0.25pF
Pass-through capacitance <1.4pF
Capacitance between anodes <0.045pF
Cathode-heater capacity <13pF
Operating time >2000h
Purpose of 6N21B pins:
1 cathode 1
2 screen
3 grid 1
4 anode 1
5 heat
6 cathode 2
7 circumcised
8 grid 2
9 anode 2
10 glow
Connection diagram for tube electrodes 6N21B
Bending and soldering of leads closer than 3mm from the body is not allowed to avoid the formation of glass cracks on the cylinder.
Limit parameters of the 6N21B tube:
(each triode)
Filament voltage 5.7..7.0V
Anode voltage 250V
Locked Lamp Anode Voltage
350V
Grid voltage -50V
Maximum power at the anode 1.0 W
Maximum voltage between cathode and heater ±200V
Maximum cathode current
10mA
Maximum resistance in grid circuit 2Mohm
Maximum cylinder temperature +220°C
Temperature range -60..+125°C
