Electronic tube and vacuum tube catalog

Base

—

Socket code

B7G

Sections

1

Heater

12.6 V / 450 mA

Plate

30 V

Screen

16 V

rP

480 Ω

gm

7 mA/V

7 pins - B7G - Miniature 7-contact

Space-charge-grid tetrode power-amplifier driver designed for direct operation from an automotive battery, providing useful low-voltage power gain without a conventional high-voltage plate supply.

Base

—

Socket code

—

Sections

1

Heater

1.25 V / 26 mA

Plate

12 V

Directly heated oxide-cathode electrometer tetrode intended for precision measuring applications requiring extremely small currents and sensitive DC signal amplification.

Base

—

Socket code

B7G

Sections

1

Heater

2.5 V / 200 mA

Plate

12 V

Screen

12 V

rP

1,700,000 Ω

gm

0.04 mA/V

μ

5

7 pins - B7G - Miniature 7-contact

Screen-grid electrometer tetrode with extremely low grid current and very high effective gain, designed for precision instrumentation involving minute input currents.

Base

Philips 4-pin

Socket code

—

Sections

1

Heater

1.15 V / 60 mA

Plate

20 V

rP

4,500 Ω

gm

1 mA/V

μ

4.5

4 pins

Early directly heated Philips high-vacuum tetrode for battery receivers, designed for low-voltage detector and amplifier service with exceptionally economical filament operation.

Base

Philips 4-pin

Socket code

—

Sections

1

Heater

1.85 V / 60 mA

Plate

20 V

rP

4,500 Ω

gm

1 mA/V

μ

4.5

4 pins

Early directly heated Philips high-vacuum tetrode for battery receivers, designed for low-voltage detector and amplifier service with economical filament operation.

Base

A

Socket code

—

Sections

1

Heater

3 V / 60 mA

Plate

20 V

rP

4,500 Ω

gm

1 mA/V

μ

4.5

4 pins

Directly heated double-grid tetrode for detection, RF and LF amplification, and output service at unusually low anode voltage, using space-charge-grid operation for battery receivers.

Base

A

Socket code

—

Sections

1

Heater

3.7 V / 60 mA

Plate

20 V

rP

4,500 Ω

gm

1 mA/V

μ

4.5

4 pins

Directly heated double-grid tetrode for detection, RF and LF amplification, and output service at very low anode voltage, suited to economical battery receivers.

Base

—

Socket code

P8A

Sections

1

Heater

6.3 V / 120 mA

Plate

15 V

Ik max

0.72 mA

gm

0.45 mA/V

μ

40

8 pins - P8A - European 8-pin side-contact base

Low-noise electrometer tetrode for digital instruments and precision measuring circuits. High input resistance and reduced noise suit very-small-current measurement.

Base

—

Socket code

—

Sections

1

Heater

12.6 V / 200 mA

Plate

20 V / 1 W

Screen

20 V / 0.4 W

Ik max

35 mA

gm

3.3 mA/V

μ

10

Telefunken space-charge-grid tetrode for special low-voltage operation, with its internal space-charge grid tied to the screen grid.

Base

—

Socket code

—

Sections

1

Heater

1.25 V / 13 mA

Plate

10 V

gm

0.017 mA/V

Subminiature electrometer tetrode for precision measurement, specified for extraordinarily low grid current around 3×10⁻¹⁵ A and low-power DC filament operation.

Base

—

Socket code

—

Sections

1

Heater

170 mA

Plate

40 V

Low-voltage bi-grid receiving tube for detection and RF or AF amplification. Its design reduces plate-battery voltage and operating cost in battery receivers.

Base

—

Socket code

—

Sections

1

Heater

4 V / 70 mA

Plate

20 V

gm

0.8 mA/V

μ

4.5

Directly heated space-charge-grid double-grid tube for very-low-anode-voltage detector and AF-amplifier service in portable battery receivers.

Base

—

Socket code

—

Sections

1

Heater

3 V / 100 mA

Plate

12 V

Screen

12 V

gm

0.17 mA/V

μ

2.5

Directly heated electrometer tetrode using a space-charge grid for extremely low-current measurement, with very low grid current and explicit precautions concerning insulation, vibration, and ionization.

Base

—

Socket code

—

Sections

1

Heater

1.25 V / 50 mA

Plate

12 V

gm

0.138 mA/V

Directly heated electrometer tetrode using a space-charge grid for extremely low-current measurement, with very low grid current and careful insulation requirements for precision instrumentation.