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Power - Pentode Single (NOT beam) (under 10W) ·Pentode

50HK6

Beam-power pentode designed for radio-receiver audio-output stages, with high peak-current capability and a tapped heater for panel-lamp operation.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7FZ
Socket code
B7G
Base pins
7
Nominal heater
50 V / 150 mA

Description

Power pentode for audio-frequency power-output stages of radio receivers, with a tapped heater for a panel lamp. Extracted from the supplied RCA Receiving Tube Manual excerpt.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7FZ
Socket code
B7G
Base pins
7
Nominal heater voltage
50 V
Nominal heater current
150 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7FZ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1G3AG3 — Suppressor GridGroup 7FZ1

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FZ

PIN1KAK — CathodeGroup 7FZ1

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FZ

PIN2G1AG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FZ

PIN3KAK — CathodeGroup 7FZ3

EIA unusually shows H+K at pin 3; manufacturer cross-check required

Unverified

EIA Base Connections, printed page 129, 7FZ

PIN3H—H — HeaterGroup 7FZ3

EIA unusually shows H+K at pin 3; manufacturer cross-check required

Unverified

EIA Base Connections, printed page 129, 7FZ

PIN4H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FZ

PIN5G2AG2 — Screen Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FZ

PIN6HCT—HCT — Heater Center Tap

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FZ

PIN7PAP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FZ

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
10000 Ω
Transconductance
0.0075 S
Max plate voltage
150 V
Max screen voltage
130 V
Max plate dissipation
5.5 W
Max screen dissipation
1.1 W

Promoted from published ratings/characteristics tables; additional published values retained in TUBE_SECTION_PARAMETER.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage

    50 V

  • Heater current

    150 mA

  • Heater tap voltage

    7 V

  • Plate voltage

    110 V

    ClassA1

  • Screen voltage

    110 V

    ClassA1

  • Maximum signal power output

    1.9 W

    ClassA1

Capacitance

  • Grid-to-plate capacitance

    0.5 pF

  • Input capacitance

    14 pF

  • Output capacitance

    3 pF

Data set 02

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Typical plate voltage

    110 V

    ClassA

  • Typical screen voltage

    110 V

    ClassA

  • Zero-signal plate current

    49 mA

    ClassA

  • Load resistance

    3000 ohm

    ClassA

  • Maximum-signal power output

    1.9 W

    ClassA

  • Maximum plate voltage

    150 V

    PromotedValue

  • Maximum screen voltage

    130 V

    PromotedValue

  • Maximum plate dissipation

    5.5 W

    PromotedValue

  • Maximum screen dissipation

    1.1 W

    PromotedValue

  • Heater Tap Voltage When Panel Lamp Fails Rms

    14 V

    PublishedTable

  • Grid #2 Voltage

    130 V

    PublishedTable

  • Plate Dissipation

    5.5 W

    PublishedTable

  • Grid #2 Dissipation

    1.1 W

    PublishedTable

  • Peak Af Grid #1 Voltage

    7.5 V

    PublishedTable

  • Zero—Signal Plate Current

    49 mA

    PublishedTable

  • Total Harmonic Distortion~ (Approx.)

    9 %

    PublishedTable

  • Max.—Signal Power Output

    1.9 W

    PublishedTable

  • (Between Pins 3 & 6) 150 150 150 150 150 150

    150 mA

    PublishedTable

  • Panel—Lamp Shunting Resistor --- --- 370. 175 120 ,Fl8

    73 ohm

    PublishedTable

Characteristics

  • Plate resistance

    10000 ohm

    PromotedValue

  • Transconductance

    0.0075 A/V

    PromotedValue

  • Average Characteristics 5O Volts

    150 mA

    PublishedTable

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater tap voltage

    7 V

    WithoutPanelLamp

  • RMS heater tap voltage if panel lamp fails

    14 V

  • Plate voltage

    110 V

    ClassA

  • Screen voltage

    110 V

    ClassA

  • Control-grid voltage

    -7.5 V

    ClassA

  • Zero-signal plate current

    49 mA

    ClassA

  • Maximum-signal plate current

    50 mA

    ClassA

  • Maximum-signal screen current

    8.5 mA

    ClassA

  • Load resistance

    2500 ohm

    ClassA

  • Power output

    1.9 W

    ClassA