Nuvistor Tubes (all numbers) ·Triode
Ruggedized Russian metal-ceramic high-frequency triode for grounded-grid amplification and oscillator service.
High-mu superminiature metal-ceramic triode for voltage amplification and oscillation in the decimeter wavelength range, with high vibration, shock, and temperature endurance.
The 6S53NV, written 6С53Н-В in the Russian technical reference, is a ruggedized superminiature triode designed for high-frequency voltage amplification and oscillation in common-grid circuits operating in the decimeter-wave band. The manufacturer describes a metal-ceramic envelope with an approximate mass of 3 g.
The related 6S53N / 6С53Н is the standard version. The -В variant has separately specified electrical tolerances, lower feedthrough capacitance, higher mechanical endurance, and an extended ambient operating range.
The tube contains an anode, control grid, and indirectly heated cathode. Its characteristic test conditions are 6.3 V heater, 120 V anode voltage, and 68 Ω cathode resistance.
| Parameter | 6S53NV |
|---|---|
| Heater current | 130 ± 20 mA |
| Anode current | 9 ± 2.5 mA |
| Anode current at −5 V grid voltage | ≤50 µA |
| Grid reverse current | ≤0.1 µA |
| Cathode-to-heater leakage | ≤20 µA |
| Transconductance | 12 ± 2.5 mA/V |
| Transconductance at 5.7 V heater | 8 mA/V |
| Amplification factor | 80 ± 20 |
| Input resistance at 60 MHz | ≥10 kΩ |
| Equivalent noise resistance | ≤0.5 kΩ |
| Vibration-induced noise voltage | ≤40 mV |
The reference additionally gives acceptance criteria of grid reverse current ≤1.5 µA, transconductance ≥8 mA/V, and allowable transconductance variation of +30% / −35%.
The published amplification factor and transconductance characterize a high-mu, high-slope triode for the specified high-frequency circuit service.
The manufacturer explicitly identifies common-grid voltage amplification and oscillation in the decimeter wavelength range.
In a common-grid amplifier, the grid is the common RF reference, the signal enters the cathode circuit, and output is taken from the anode. This changes the circuit's input impedance and feedback relationships compared with grounded-cathode operation.
The datasheet provides electrical characteristic curves but does not specify a universal frequency response, circuit gain, or oscillator resonator.
| Measurement | Value |
|---|---|
| Input capacitance | 6.75 ± 0.75 pF |
| Output capacitance | 1.5 ± 0.5 pF |
| Feedthrough capacitance | ≤0.05 pF |
| Cathode-to-heater capacitance | 2.5 ± 0.5 pF |
The small feedthrough capacitance is particularly relevant to minimizing unwanted input-output coupling in high-frequency operation.
| Parameter | Limit |
|---|---|
| Heater voltage | 5.7–7.0 V |
| Anode voltage | 120 V |
| Anode voltage at cutoff | 330 V |
| Maximum negative grid voltage | 55 V |
| Cathode-to-heater voltage | 100 V |
| Cathode current | 15 mA |
| Anode dissipation | 1.2 W |
| Grid dissipation | 0.2 W |
| Grid-circuit resistance | 1 MΩ |
| Maximum envelope temperature | 250°C |
The 330 V anode limit applies to the cutoff condition, not ordinary conducting operation.
| Condition | 6S53NV rating |
|---|---|
| Vibration acceleration | 20 g |
| Vibration-frequency range | 5–5,000 Hz |
| Repeated shock | 150 g |
| Single shock | 1,000 g |
| Sustained acceleration | 150 g |
| Ambient temperature | −60°C to +200°C |
| Minimum operating life | 2,000 hours |
The ruggedized variant has substantially greater mechanical and thermal endurance than the standard 6S53N, although the standard type has a longer specified minimum service life of 5,000 hours under its conditions.
The Russian reference provides plate-current curves for several grid-bias values and transfer curves at different anode voltages. These document the relation between anode current, grid voltage, and plate voltage for the ruggedized triode.
The 6S53NV / 6С53Н-В is a 6.3 V, 130 mA high-mu metal-ceramic triode for common-grid decimeter-wave amplification and oscillation. It has nominal 80 amplification factor, 12 mA/V transconductance, and 9 mA anode current at the published test point.
Its low feedthrough capacitance, high-frequency input-resistance specification, and ruggedized 20 g vibration, 1,000 g single-shock, and +200°C ambient qualifications distinguish it from the standard 6S53N.
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
12000 uS
Published operating point
Amplification factor
80
Published operating point
Guaranteed service life
2000 h
Published source value