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6267

High-gain low-noise pentode designed for audio preamplifier and input stages. Amperex documentation emphasizes minimizing hum, noise, and microphony, making sensitive low-level audio voltage amplification its defining application.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 200 mA

Description

High-gain low-noise pentode for audio preamplifier and input stages where hum, noise, and microphony must be minimized.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 200 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: 2500000 Ω
Transconductance: 0.002 S
Max plate voltage: 300 V
Max screen voltage: 500 V
Max plate dissipation: 1 W
Max screen dissipation: 0.2 W
Max cathode current: 6 mA

High-gain low-noise pentode; promoted from 250 V characteristic point.

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

1956 Amperex Hi Fi Brochure

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Plate Voltage
250 V
Screen Voltage
140 V
Plate Current
3 mA
Screen Current
0.6 mA
Control Grid Voltage
-2 V
Transconductance
2000 uS
Equivalent Input Noise Voltage
2 uV
Bandwidth=25-10000Hz

Other

Maximum Grid Resistance
3000000 ohm
PlateDissipation>0.2W
Maximum Grid Resistance
10000000 ohm
PlateDissipation<0.2W
Maximum Filament-to-Cathode Voltage
100 V
Cathode positive

Data set 02

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
VoltageAmplifier
Screen voltage
140 V
VoltageAmplifier
Grid voltage
-2 V
VoltageAmplifier
Plate current
3 mA
VoltageAmplifier
Screen current
0.6 mA
VoltageAmplifier

Characteristic

Plate resistance
2500000 ohm
Transconductance
2000 µS

Data set 03

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
AudioPreamplifier
Screen voltage
140 V
AudioPreamplifier
Control-grid voltage
-2 V
AudioPreamplifier
Plate current
3 mA
AudioPreamplifier
Screen current
0.6 mA
AudioPreamplifier
Application
Low-hum low-noise low-microphony preamplifier/input stage
Section1

Characteristic

Plate resistance
2.5 MΩ
Section1
Transconductance
2000 µS
Section1