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53

Directly heated power-output triode intended for audio-frequency amplifier service. Manufacturer operating data emphasize output-stage use rather than RF transmitting duty, placing it functionally with receiving and audio power triodes.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 7B
Socket code: UX6
Base pins: 7
Nominal heater: 2.5 V / 2 A

Description

Dual power triode for Class B amplifier service.

Socket description

Small 6-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7B
Socket code: UX6
Base pins: 7
Nominal heater voltage: 2.5 V
Nominal heater current: 2 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7B - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1H	—	H — Heater EIA transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7B
PIN22P	B	P — Plate (Anode) EIA transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7B
PIN32G1	B	G1 — Control Grid EIA transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7B
PIN4K	A	K — Cathode EIA transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7B
PIN51G1	A	G1 — Control Grid EIA transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7B
PIN61P	A	P — Plate (Anode) EIA transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7B
PIN7H	—	H — Heater EIA transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7B
CAP1G4	A	G4 — Fourth Grid EIA transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7B

Section ratings

2 physical sections, with 1 unique section. The remaining sections have identical specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 11000 Ω
Transconductance: 0.0032 S
Amplification factor: 35
Max plate voltage: 300 V
Max plate dissipation: 10 W
Max cathode current: 40 mA

Representative row for two identical triode sections; ratings and characteristics apply per plate/section as printed.

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 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Maximum peak plate current per plate
125 mA
PerPlate
Maximum average plate dissipation
10 W
PerPlate
Plate voltage
250 V
ClassB
Grid bias
0 V
ClassB
No-signal plate current per plate
14 mA
ClassB
Load resistance plate-to-plate
8000 ohm
ClassB
Plate voltage
300 V
ClassB
No-signal plate current per plate
17.5 mA
ClassB; PlateVoltage=300V
Load resistance plate-to-plate
10000 ohm
ClassB; PlateVoltage=300V
Power output
10 W
ClassB; PlateVoltage=300V
Plate voltage
180 V
ClassA; TriodesParallel
Grid bias
-5 V
ClassA; TriodesParallel; PlateVoltage=180V
Plate voltage
204 V
ClassA; TriodesParallel
Grid bias
-6 V
ClassA; TriodesParallel; PlateVoltage=204V

Characteristic

Amplification factor
35
ClassA; TriodesParallel
Plate resistance
11300 ohm
ClassA; TriodesParallel; PlateVoltage=180V
Transconductance
3100 uS
ClassA; TriodesParallel; PlateVoltage=180V
Plate resistance
11000 ohm
ClassA; TriodesParallel; PlateVoltage=204V
Transconductance
3200 uS
ClassA; TriodesParallel; PlateVoltage=204V

Data set 02

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HeaterVoltageNominal
2.5 V
Nominal
HeaterCurrentNominal
2 A
Nominal
Maximum Plate Voltage
300 V
Maximum Plate Dissipation
2.5 W
Maximum Cathode Current
40 mA

Characteristic

Transconductance
3200 µS
Typical
Amplification Factor
35
Typical
Plate Resistance
11000 ohm
Typical

Data set 03

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Application

Service
Class B power amplifier
ClassB

Data set 04

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Maximum plate voltage
300 V
Published handbook rating
Plate voltage
300 V
ClassA
Control-grid bias
0 V
ClassA
Plate current
17.5 mA
ClassA
Power output
10 W
ClassA
Push-pull plate voltage
300 V
ClassB PushPull TwoTubes
Push-pull control-grid voltage
0 V
ClassB PushPull TwoTubes
Push-pull plate current
17.5 mA
ClassB PushPull TwoTubes
Push-pull load resistance
8000 ohm
ClassB PushPull TwoTubes
Push-pull power output
10 W
ClassB PushPull TwoTubes
Parallel plate voltage
294 V
ClassA SectionsParallel
Parallel control-grid bias
6 V
ClassA SectionsParallel

Characteristic

Plate resistance
8000 ohm
Published handbook characteristic
Heater/filament voltage
2.5 V
Published heater/filament rating
Heater/filament current
2 A
Published heater/filament rating
Parallel plate resistance
11000 ohm
SectionsParallel
Parallel transconductance
3200 µS
SectionsParallel
Parallel amplification factor
35
SectionsParallel

Data set 05

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
2.5 V
Heater current
2 A
Maximum peak plate current per plate
125 mA
EachSection
Plate voltage
250 V
ClassA1;ParallelSections
Power output
10 W
ClassB2;PushPull;TwoTubes
Effective load resistance plate-to-plate
8000 ohm
ClassB2;PushPull

Characteristic

Plate current
6 mA
ClassA1;ParallelSections