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1ZH18B
Pentode for HF and intermediate frequency amplification.
Envelope: sub-miniature, glass.
Mass 4 g.

General characteristics:

Type 1ZH18B
Filament voltage, Volt 1,2
Anode voltage, Volt 60
2nd grid voltage, Volt 45
1st grid voltage, Volt 0
Type 1ZH18B
Filament (heater) current, mA 23,5±2,5
Anode current, mA 1,35±0,5
2nd grid current, mA £0,25
Reverse 1st grid current, mkA £ 0,5
Mutual conductance, mA/V 1,15 to 0,45
Internal resistance, Kohm ≥100
Equivalent noise resistance, kOhm 7
Vibration noise (by RA=2 KOhm), mV £ 50
Inter electrode capacitance, pF:  
input 3,25±0,9
output 2,4±0,4
transfer £ 0,01
Operation time, h 3000

Limited operating values:

Type 1ZH18B
Filament voltage, V 1,08-1,32
Anode voltage, V 90
2nd grid voltage, V 60
Cathode current, mA 2,5
Resistance in 1st grid circuit, MOhm 1
Tubes temperature, ° 85

Operating environmental conditions :

Type 1ZH18B
Acceleration of vibration loads, g 6
by frequencies, Hz 5-600
Acceleration of multiple impacts, g 150
Acceleration of single impact, g 500
Continuos acceleration, g 100
Ambient temperature, ° -60 to +85
Relative humidity at up to 40°C, % 98