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Power - Tetrode (NOT beam) ·Rectifier-Tetrode

117P7GT

Brimar combination tube containing a rectifier section and a power tetrode, using a 117 V series heater. It integrates rectification and output amplification in one envelope for compact mains-powered equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
8AV
Socket code
IO
Base pins
8
Nominal heater
117 V / 90 mA

Description

The BRIMAR 117P7GT combines a rectifier section with a power tetrode section and uses a 117 V, 0.09 A heater.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8AV
Socket code
IO
Base pins
8
Nominal heater voltage
117 V
Nominal heater current
90 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8AV - 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

Rectifier

X-ray radiationInterelectrode capacitances
Rectifier peak inverse voltage
350 V
Rectifier nominal output current
75 mA
Rectifier peak forward current
450 mA
Rectifier forward voltage drop
16 V
Rectifier max heater-cathode voltage
176 V

Published handbook ratings and operating characteristics reviewed.

Section 2

Tetrode

X-ray radiationInterelectrode capacitances
Plate resistance
17000 Ω
Transconductance
0.0053 S
Max plate voltage
117 V
Max screen voltage
117 V
Max plate dissipation
6 W
Max screen dissipation
1 W

Published handbook ratings and operating characteristics reviewed.

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

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • RMS Input

    117 V

    Rectifier section

SECTION 2

Tetrode

Characteristics

  • Anode Voltage

    105 V

  • Anode Current

    43 mA

  • Screen Voltage

    105 V

  • Screen Current

    4 mA

  • Control Grid Voltage

    -5.2 V

  • Cathode Bias Resistor

    125 ohm

  • Optimum Load

    4000 ohm

  • Power Output

    0.85 W

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 2

Tetrode

Other

  • Maximum plate voltage

    117 V

    Published handbook rating

  • Maximum screen voltage

    117 V

    Published handbook rating

  • Plate voltage

    105 V

    ClassA

  • Screen voltage

    105 V

    ClassA

  • Control-grid bias

    5.2 V

    ClassA

  • Plate current

    43 mA

    ClassA

  • Screen current

    4 mA

    ClassA

  • Load resistance

    4000 ohm

    ClassA

  • Power output

    0.85 W

    ClassA

  • DC output current

    75 mA

    RectifierService

  • Peak inverse voltage

    350 V

    RectifierService

  • RMS supply voltage per plate

    117 V

    RectifierService

  • Peak current

    450 mA

    RectifierService

Characteristic

  • Plate resistance

    17000 ohm

    Published handbook characteristic

  • Transconductance

    5300 µS

    Published handbook characteristic

  • Heater/filament voltage

    117 V

    Published heater/filament rating

  • Heater/filament current

    90 mA

    Published heater/filament rating

  • Tube voltage drop

    6 V

    At 150 mA DC

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • AC Plate Voltage RMS

    117 V

    Rectifier

  • DC Output Current

    75 mA

    Rectifier

  • Max Imum Ac Plate Voltage (Rms)

    117 V

  • Max{Imum Dc Heater To Cathode Potential

    176 V

  • Max Imum Peak Inverse Voltage

    350 V

  • Max Imum Steady State Peak Plate Current

    450 mA

SECTION 2

Tetrode

Other

  • Max Imum Plate Voltage

    117 V

  • Max Imum Screen Voltage

    117 V

  • Max Imum Plate Dissipation

    6 W

  • Maximum Screen Dissipation

    1 W

  • Plate Voltage

    10 V

  • Screen Voltage

    106 V

  • Control Grid Voltage *

    -5.2 V

  • Zero Signal Plate Current

    43 mA

  • Max Imum S1Gnal Plate Current

    43 mA

  • Zero Signal Screen Current

    4 mA

  • Max Imum Signal Screen Current

    5.5 mA

  • Plate Resistance Approx.

    17000 ohm

  • Transconductance

    5300 uS

  • Load Resistance

    4000 ohm

  • Max Imum Signal Power Output

    0.85 W

  • Ac Plate Voltage (Rms)

    117 V

  • Minimum Total Effective Plate Supply Impedance

    15 ohm