Electronic tube and vacuum tube catalog

Base

TDJ

Socket code

Refer to variations

Electrical Summary

Heater	1.4 V / 25 mA
Plate	S2: 90 V / 0.03 W
Screen	S2: 90 V / 0.01 W
Ik max	S1: 0.2 mAS2: 0.25 mA
Rectifier	S1: 200 mA
gm	S2: 0.17 mA/V

Sections

2

7 pins

Directly heated battery diode-pentode combining radio signal detection with subsequent low-frequency voltage amplification. The diode recovers the received signal while the pentode provides AF gain in economical portable receivers.

Base

B7G

Socket code

B7G

Electrical Summary

Heater	1.4 V / 25 mA
Plate	S2: 120 V / 0.03 W
Screen	S2: 90 V / 0.01 W
Ik max	S1: 0.2 mAS2: 0.25 mA
Rectifier	S1: 200 mA
V Inverse	S1: 100 V
rP	S2: 1,000,000 Ω
gm	S2: 0.7 mA/V
μ	S2: 16

Sections

2

7 pins - B7G - Miniature 7-contact

Low-consumption directly heated diode-pentode for detection and audio-frequency voltage amplification in battery receivers. Its 1.4 V, 25 mA filament makes it especially economical for portable equipment where battery life is important.