Electronic tube and vacuum tube catalog

Base

—

Socket code

SUBMINIATURE8

Electrical Summary

Heater	1.25 V / 20 mA
Plate	S1: 22.5 VS2: 22.5 V
Ik max	S1: 0.3 mAS2: 0.3 mA
gm	S1: 0.16 mA/VS2: 0.16 mA/V
μ	S1: 2.4S2: 2.4

Sections

2

8 pins - SUBMINIATURE8 - Subminiature 8-lead base

Directly heated subminiature double-tetrode electrometer tube designed for extremely low-current measurement circuits.

Base

7D

Socket code

—

Electrical Summary

Heater	0.625 V / 50 mA
Plate	S1: 22.5 VS2: 22.5 V
Ik max	S1: 0.5 mAS2: 0.5 mA
gm	S1: 0.065 mA/VS2: 0.065 mA/V

Sections

2

7 pins

Directly heated subminiature double space-charge tetrode designed for cascaded audio-frequency voltage-amplifier service.

Base

8CC

Socket code

—

Electrical Summary

Heater	1.25 V / 20 mA
Plate	S1: 13.5 VS2: 13.5 V
gm	S1: 0.16 mA/VS2: 0.16 mA/V
μ	S1: 2.4S2: 2.4

Sections

2

8 pins

Directly heated subminiature twin tetrode designed for electrometer service, with extremely low nominal control-grid current for precision measurement.

Base

—

Socket code

B9A

Electrical Summary

Heater	1.25 V / 20 mA
Plate	S1: 10 VS2: 10 V
Ik max	S1: 1 mAS2: 1 mA
gm	S1: 0.025 mA/VS2: 0.025 mA/V

Sections

2

9 pins - B9A - Small-button Noval 9-contact

Directly heated dual space-charge-grid electrometer tetrode designed for measuring extremely small currents and voltages, with exceptionally low grid reverse current.