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Manufacturer

Voshod-KRLZ

248009, Russia, Kaluga, Grabtsevskoe shosse, 43

krlz@made-in-zelenograd.com

THE PROFESSIONAL TUBE 12AX7VKA (ECC83)

General information

Miniature double triode with separate indirectly heated cathodes with spiral heater is intended for being employed as phase inverter or as double amplifier with resistive feedback.

Pin arrangement

Mass not more than 15 g.

Currentvoltage characteristic (I-V chart)

Electrode-to-lead connection diagram

Pin numberdescription
1plate 2
2grid 2
3cathode 2
4, 5 and 9heater
6plate 1
7grid 1
8cathode 1

Parameters, conditions and unitsNominal
mintypemax
Grid reverse current, µA, (at: heater voltage 6.3 V, plate voltage 250 V, grid voltage minus 1.5 V, resistance in grid circuit 1.0 MΩ)--0.2
Transconductance, mA/V (at: heater voltage 6.3 V, plate voltage 250 V, grid voltage minus 1.5 V)1.41.92.65
Plate current, mA, (at: heater voltage 6.3 V, plate voltage 250 V, grid voltage minus 1.5 V)1.2--
Heater current, mA, (at: heater voltage 6.3 V)305340375
Plate current at the beginning of the characteristic, µA, (at: heater voltage 6.3 V, plate voltage 250 V, grid voltage minus 5.5 V)--10
Cathode-heater leakage current, µA (at: heater voltage 6.3 V, heater to cathode voltage 250 V)--15
Input capacitance, pF1.82.152.5
Transfer capacitance, pF-0.550.8
Output capacitance, pF1.31.92.5
Triode plate 1 to triode plate 2 capacitance, pF--0.7
Amplification factor (at: heater voltage 6.3 V, plate voltage 250 V, grid voltage minus 1.5 V)8591110
Noise voltage in a range 20 Hz 10KHz, µV (for heater voltage 6.3 V, plate voltage 250 V, grid circuit resistance 0 M?, plate circuit resistance 100 KΩ, cathode circuit resistance 2700 Ω)--300
Long life, hours510-
Electrical parameters at (2985) K
Parameters, conditions and unitsNominal
mintypemax
Grid reverse current, µA, (at: heater voltage 6.3 V, plate voltage 250 V, grid voltage minus 1.5 V, resistance in grid circuit 1.0 MΩ)--0.2
Transconductance, mA/V (at: heater voltage 6.3 V, plate voltage 250 V, grid voltage minus 1.5 V)1.41.92.65
Plate current, mA, (at: heater voltage 6.3 V, plate voltage 250 V, grid voltage minus 1.5 V)1.2--
Heater current, mA, (at: heater voltage 6.3 V)305340375
Plate current at the beginning of the characteristic, µA, (at: heater voltage 6.3 V, plate voltage 250 V, grid voltage minus 5.5 V)--10
Cathode-heater leakage current, ?A (at: heater voltage 6.3 V, heater to cathode voltage 250 V)--15
Input capacitance, pF1.82.152.5
Transfer capacitance, pF-0.550.8
Output capacitance, pF1.31.92.5
Triode plate 1 to triode plate 2 capacitance, pF--0.7
Amplification factor (at: heater voltage 6.3 V, plate voltage 250 V, grid voltage minus 1.5 V)8591110
Noise voltage in a range 20 Hz 10KHz, µV (for heater voltage 6.3 V, plate voltage 250 V, grid circuit resistance 0 MΩ, plate circuit resistance 100 KΩ, cathode circuit resistance 2700 Ω)--300
Long life, hours510-
Maximum permissible operating conditions
Parameters, unitsNominal
minmax
Heater voltage, V:6.06.6
for parallel connection12.013.2
for series connection
Plate voltage, V-300
Heater to Cathode voltage, V:-100
positive-100
negative
Cathode current, mA10
Plate dissipation, each triode, W-1.0
Grid circuit resistance, each triode, MΩ-1.0
Temperature at the most heated part of the envelope, K-368

The tube have the following additional advantages: shock resistance, vibration resistance, reliable perfomance at high altitudes, high temperature resistance, stability of electrical values, extended heater life.

Miniature double triode with separately heated cathodes of 6N1P type intended for low frequency voltage amplification in wireless devices.

Lead Layout

Lead Lead Name
1Anode of the first triode
2Grid of the first triode
3Cathode of the first triode
4,5Heater
6Anode of the second triode
7Grid of the second triode
8Cathode of the second triode
9Screen
Main Electrical Characteristics at the temperature of 25 10°

Main Electrical Characteristics(at the temperature of 25 ± 10°)
Characteristic Name, Unit of Measurement, Measurement ConditionsLetter DesignationNormal Value
MinimumMaximum
Grid reverse current, mcA, (at heater voltage 6.3 V, anode voltage - 250 V, automatic grid voltage, grid-circuit resistance 1.0 megohm, cathode-circuit resistance 0.6 kilohm)Ig reverse-1
Transconductance, m/V, (at heater voltage 6.3 V, anode voltage - 250 V, automatic grid voltage, cathode-circuit resistance 0.6 kilohm)S3.55.5
Anode current, m, (at heater voltage 6.3 V, anode voltage - 250 V, automatic grid voltage, cathode-circuit resistance 0.6 kilohm)I5.610.5

Miniature double triode with separately heated cathodes of 6N2P type intended for low frequency voltage amplification in wireless devices.

Lead Layout

Lead Lead Name
1Anode of the first triode
2Grid of the first triode
3Cathode of the first triode
4,5Heater
6Anode of the second triode
7Grid of the second triode
8Cathode of the second triode
9Screen
Main Electrical Characteristics(at the temperature of 25 ± 10°)
Characteristic Name, Unit of Measurement, Measurement ConditionsLetter DesignationNormal Value
MinimumMaximum
Grid reverse current, mc, (at heater voltage 6.3 V, anode voltage - 250 V, automatic grid voltage, grid-circuit resistance 1.0 megohm, cathode-circuit resistance 0.6 kilohm)Ig reverse-0.5
Transconductance, m/V, (at heater voltage 6.3 V, anode voltage - 250 V, automatic grid voltage, cathode-circuit resistance 0.6 kilohm)S1.82.6
Anode current, m, (at heater voltage 6.3 V, anode voltage - 250 V, automatic grid voltage, cathode-circuit resistance 0.6 kilohm)I1.82.0

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