Nuvistor Tubes (all numbers) ·Triode
Russian economical low-voltage metal-ceramic triode for general radio equipment.
An economical metal-ceramic triode intended for universal radio equipment operating at low supply voltage.
The 6S63N, written 6С63Н in the Russian technical reference, is a low-voltage, economical superminiature triode intended for use in universal radio equipment. The manufacturer explicitly identifies its low-voltage operating role and describes a metal-ceramic envelope weighing approximately 3 g.
The principal characteristic measurements use only 27 V anode voltage, indicating an intended operating region substantially below that of conventional high-voltage receiving amplifiers.
The 6S63N contains an anode, control grid, and indirectly heated cathode. The manufacturer drawing shows grouped connections 1, 2, 3 for the anode, 4, 5, 6 for the grid, 7, 8, 9 for the cathode, and 10 and 12 for the heater.
The basic test conditions are 6.3 V heater, 27 V anode, and 130 Ω cathode resistor.
| Characteristic | Value |
|---|---|
| Heater current | 130 ± 20 mA |
| Anode current | 7 ± 2 mA |
| Anode current at −7 V grid bias | ≤50 µA |
| Grid reverse current at −1.5 V | ≤0.1 µA |
| Cathode-to-heater leakage | ≤20 µA |
| Transconductance | 8 mA/V, +2/−1.5 |
| Amplification factor | 15 ± 5 |
| Input resistance at 60 MHz | ≥10 kΩ |
| Equivalent internal noise resistance | 0.3–0.5 kΩ |
| Vibration-induced noise voltage | ≤40 mV |
The amplification factor of approximately 15 is substantially lower than that of many high-mu receiving triodes, while the transconductance remains relatively high at the specified low-voltage test point.
The manufacturer describes the tube as suitable for universal radio equipment and specifically characterizes it as low-voltage and economical.
The 27 V anode characteristic point supports its use where high-voltage supply rails are unavailable or undesirable. The source does not specify a universal oscillator frequency or one complete radio receiver circuit, so these should not be inferred.
| Measurement | Value |
|---|---|
| Input capacitance | 4.2 ± 0.8 pF |
| Output capacitance | 2.3 ± 0.7 pF |
| Feedthrough capacitance | ≤2.2 pF |
These capacitances influence input loading and feedback in radio-frequency and amplifier circuits.
| Parameter | Limit |
|---|---|
| Heater voltage | 5.7–7.0 V |
| Anode voltage | 100 V |
| Anode voltage at cutoff | 300 V |
| Cathode-to-heater voltage | 100 V |
| Cathode current | 15 mA |
| Anode dissipation | 1.2 W |
| Grid dissipation | 0.02 W |
| Grid-circuit resistance | 5 MΩ |
| Envelope temperature | 250°C |
The cutoff-condition anode voltage is a separate rating, not a permissible 300 V continuous conducting operating point.
The reference specifies at least 5,000 hours of operating life, 15 g vibration acceleration over 5–2,500 Hz, 150 g repeated shock, 1,000 g single shock, 150 g sustained acceleration, and an ambient operating range of −60°C to +200°C.
These are substantial endurance specifications for a compact radio receiving tube.
The 6S63N / 6С63Н is a 6.3 V superminiature metal-ceramic low-voltage triode for universal radio equipment. Its principal test point uses 27 V anode voltage, with approximately 7 mA anode current, 8 mA/V transconductance, and 15 amplification factor.
Its economical low-voltage design, compact construction, specified noise characteristics, and high mechanical and temperature endurance distinguish it from conventional glass receiving triodes.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Promoted values translated from the filename-designated Russian entry only.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Nominal heater voltage
6.3 V
Published source value
Nominal heater current
130 mA
Published source value
Transconductance
8100 uS
Published operating point
Amplification factor
15
Published operating point
Guaranteed service life
2500 h
Published source value