Data set 01
2026 Russian Receiving
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Plate Voltage
70 V
Voltage - Triode (under 100V) ·Triode
1S38A
Russian 1S38A miniature directly heated low-voltage triode for audio amplification and HF oscillation, with 0.9 V 85 mA filament, mu 24.5 and gm 0.77 mA/V.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 0.9 V / 85 mA
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater voltage
- 0.9 V
- Nominal heater current
- 85 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.00077 S
- Amplification factor
- 24.5
Russian receiving tube 1S38A, one-page compiled specification. Miniature glass directly heated oxide-cathode triode with flexible leads, intended for low-frequency power amplification and high-frequency oscillation. Nominal filament 0.9 V, current 0.085 A, specified current range 0.076–0.094 A. Amplification factor nominal 24.5, range 20–29. Transconductance nominal 0.77 mA/V (0.00077 A/V), range 0.67–0.87 mA/V (0.00067–0.00087 A/V). Listed anode operating voltage 70 V, not explicitly maximum plate rating; max_plate_voltage remains null. Reverse grid current 0.1 µA. Microphonic noise 5 mV. Plate resistance not provided. Source mass '700 g' appears implausible for miniature tube and is not promoted. Canonical base code not specified.
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.