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Voltage Radio Detector Converter ·Diode-Pentode

12S7

Remote-cutoff RF pentode combined with a diode detector for receiver amplification and demodulation. The pentode provides controlled-gain RF/IF amplification while the diode supplies signal detection.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
OCTAL
Socket code
IO
Base pins
-
Nominal heater
12.6 V / 100 mA

Description

The Philips 12S7 combines one diode section with a remote-cutoff RF pentode. The pentode section has published design-centre ratings, 2000 µS typical transconductance and interelectrode capacitances.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
OCTAL
Socket code
IO
Base pins
-
Nominal heater voltage
12.6 V
Nominal heater current
100 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

OCTAL - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
1000000 Ω
Transconductance
0.002 S
Amplification factor
18
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
2 W
Max cathode current
10 mA

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Physical diode section added in approved section-structure reconciliation.

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.

Data set 01

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Plate voltage

    200 V

  • Screen voltage

    85 V

  • Plate current

    5 mA

  • Screen current

    1.5 mA

  • Grid voltage

    -2 V

  • Transconductance

    2000 uS

  • Plate resistance

    1000000 ohm

Other

  • Maximum plate supply voltage

    550 V

  • Maximum grid circuit resistance

    3 Mohm

Capacitance

  • Grid-to-heater capacitance maximum

    0.05 pF