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50C6GA

High-sensitivity beam-power amplifier for receiver audio-output service, providing useful Class-A output at comparatively low DC supply voltage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7AC
Socket code: U7A
Base pins: 7
Nominal heater: 50 V / 150 mA

Description

High-sensitivity beam power amplifier. The supplied datasheet provides maximum ratings and representative Class A operating characteristics for receiver/audio output applications.

Socket description

Small 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7AC
Socket code: U7A
Base pins: 7
Nominal heater voltage: 50 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7AC - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Pin 1	—	NC	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN2Pin 2	—	H — Heater	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN3Pin 3	A	P — Plate (Anode)	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN4Pin 4	A	G2 — Screen Grid	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN5Pin 5	A	G1 — Control Grid	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN7Pin 7	—	H — Heater	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN8Pin 8	A	BP — Beam-Forming PlateGroup AC8	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN8Pin 8	A	K — CathodeGroup AC8	Verified 12L6GT/25L6GT manufacturer basing, 7AC

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances

Plate resistance: 18300 Ω
Transconductance: 0.0071 S
Max plate voltage: 200 V
Max screen voltage: 200 V
Max plate dissipation: 12.5 W
Max screen dissipation: 1.75 W

Grid-2 electrode maximum is charted; 200-V maximum grid-2 supply voltage is retained in parameters rather than forced into MaxScreenVoltage.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Maximum plate voltage
200 V
Published handbook rating
Maximum screen voltage
200 V
Published handbook rating
Plate voltage
200 V
ClassA
Screen voltage
135 V
ClassA
Control-grid bias
14 V
ClassA
Plate current
61 mA
ClassA
Screen current
2.2 mA
ClassA
Load resistance
2600 ohm
ClassA
Power output
6 W
ClassA

Characteristic

Plate resistance
18300 ohm
Published handbook characteristic
Transconductance
7100 µS
Published handbook characteristic
Heater/filament voltage
50 V
Published heater/filament rating
Heater/filament current
150 mA
Published heater/filament rating

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
50 V
Heater current
150 mA
Maximum grid #2 supply voltage
200 V
Plate voltage
135 V
ClassA1
Screen voltage
135 V
ClassA1
Power output
3.6 W
ClassA1;135VPlate
Power output
6 W
ClassA1;200VPlate

Characteristic

Transconductance
7000 uS
135VPlate

Data set 03

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Typical plate voltage
200 V
ClassA
Typical screen voltage
135 V
ClassA
Zero-signal plate current
62 mA
ClassA
Load resistance
2600 ohm
ClassA
Maximum-signal power output
4 W
ClassA
Maximum plate voltage
200 V
PromotedValue
Maximum screen voltage
200 V
PromotedValue
Maximum plate dissipation
12.5 W
PromotedValue
Maximum screen dissipation
1.75 W
PromotedValue
Maximum Plate Diss-Ipation
125 W
PublishedTable
Maximum Grid N2 Dissipation
1.75 W
PublishedTable
Heater Current
150 mA
PublishedTable
Peak Af Grid #1 Voltage Lj.Jr
14 V
PublishedTable
Zero Signal Grid #2 Current J,Jr
22 mA
PublishedTable
Maximum Signal Grid #2 Current 11.5
9 mA
PublishedTable
Plate Resistance (Appfox.) 9 300 18
300 ohm
PublishedTable
E~ Z =
135 V
PublishedTable
Et =
50 V
PublishedTable
Eb =
135 V
PublishedTable
Eo2 =
135 V
PublishedTable

Characteristics

Plate resistance
18300 ohm
PromotedValue
Transconductance
0.0072 A/V
PromotedValue
50 Volts
150 mA
PublishedTable