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Power - Pentode (NOT beam) ·Pentode

5A102A

Output pentode with published operating conditions spanning roughly 50 mW to 1 W for moderate power-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
MEDIUM6
Base pins
6
Nominal heater
7.5 V / 850 mA

Description

Output Pentode. Output—mW. 50 100 250 500 750 1,000.

Socket description

Medium 6-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
MEDIUM6
Base pins
6
Nominal heater voltage
7.5 V
Nominal heater current
850 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
43000 Ω
Transconductance
0.0025 S
Amplification factor
110
Max plate voltage
180 V
Max screen voltage
150 V

Ratings and characteristics extracted from 5A102A.pdf.

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

1937 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Pentode

Descriptive

  • Former designation

    VLS452

    Alias

Characteristics

  • Grid-anode capacitance

    0.5 pF

  • Input capacitance

    6.8 pF

  • Output capacitance

    9 pF

Other

  • Maximum direct anode current

    50 mA

  • Maximum direct screen current

    10 mA

  • Typical load resistance

    4000 ohm

    Vp=180V;Vg2=150V

Data set 02

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • VALVE TYPE

    5 A

  • Maximum direct anode voltage

    180 volts

  • Maximum direct anode curren

    50 mA

  • Maximum direct screen voltage

    150 volts

  • Maximum direct screen curren

    10 mA

  • Maximum control grid resistance

    500000 ohms

  • Anode voltage

    180 volts

  • Screen voltage

    150 volts

  • Suppressor voltage

    0 volts

  • Load resistance

    4000 ohms

  • 100 VB

    0 VOLTS

Characteristic

  • Nominal heater voltage

    7.5 volts

  • Heater curren

    0.85 amps

  • Impedance

    43000 ohms