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Voltage - Dual Triode (similar high frequency) ·Triode-Triode

6BC8

Medium-mu twin triode designed as a cascode VHF amplifier in series-string television receivers, also suitable for push-pull cathode-drive RF amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9AJ
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 600 mA

Description

Medium-mu twin triode used as a cascode amplifier in VHF television tuners and in push-pull cathode-drive RF amplifiers.

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: 9AJ
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9AJ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12P	B	P — Plate (Anode) Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN22G1	B	G1 — Control Grid Source label preserved; pending confirmation	Unverified EIA Base Connections, printed page 131, 9AJ
PIN32K	B	K — Cathode Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN4H	—	H — Heater Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN5H	—	H — Heater Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN61P	A	P — Plate (Anode) Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN71G1	A	G1 — Control Grid Source label preserved; pending confirmation	Unverified EIA Base Connections, printed page 131, 9AJ
PIN81K	A	K — Cathode Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN9IS	A	IS — Internal Screen Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5300 Ω
Transconductance: 0.0062 S
Amplification factor: 33
Max plate voltage: 250 V
Max plate dissipation: 2.2 W
Max cathode current: 22 mA
Rectifier max heater-cathode voltage: 200 V
Rectifier warm-up time: 11 s

Published promoted fields populated semantically; identical repeated sections compressed where applicable.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5300 Ω
Transconductance: 0.0062 S
Amplification factor: 33
Max plate voltage: 250 V
Max plate dissipation: 2.2 W
Max cathode current: 22 mA

Physical triode restored under current one-row-per-physical-section policy.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Voltage....................... 6.3 4.2 Volts
4.2 V
Heater Voltage....................... 6.3 4.2 Volts
Heater Current....................... 400 600 Ma
600 mA
Heater Current....................... 400 600 Ma
Plate Voltage. . ......... ... 150 Volts
150 V
Plate Voltage. . ......... ... 150 Volts
Grid Voltage. . ...........ooviiniiiiiiiiinnas 0 Volts
0 V
Grid Voltage. . ...........ooviiniiiiiiiiinnas 0 Volts
Plate Current. .. .............. .. ... ... i 10 Ma
10 mA
Plate Current. .. .............. .. ... ... i 10 Ma
Transconductance. . . ................ ... i, 6200 umhos
6200 umhos
Transconductance. . . ................ ... i, 6200 umhos
Grid Voltage for gm = 50 umhos (approx.).. .......... 13 Volts
13 V
Grid Voltage for gm = 50 umhos (approx.).. .......... 13 Volts

Other

Plate Voltage'. . ... .. 250 Volts Max
250 V
Plate Voltage'. . ... .. 250 Volts Max
Plate Dissipation. . 2 Watts Max
2 W
Plate Dissipation. . 2 Watts Max
Cathode Current. ... .. , 20 Ma Max
20 mA
Cathode Current. ... .. , 20 Ma Max
Grid Circuit Resistance.............................. 0.5 Megohm Max
0.5 Megohm
Grid Circuit Resistance.............................. 0.5 Megohm Max

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Plate Resistance
5300 ohm
EachUnit
Transconductance
6200 uS
EachUnit

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
100 V
Cascode;EachSection
Plate current
8.5 mA
Cascode;EachSection
Application
VHF cascode amplifier in series-string television receivers
Section1

Characteristic

Transconductance
6500 µS
EachSection
Plate resistance
7000 Ω
EachSection
Amplification factor
45
EachSection

Data set 04

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid to plate
1.2 pF
PublishedColumn1
Input: G to (K, IS, H)
2.6 pF
Input:° K to (G, IS, H)
5.5 pF
Output: P to (K, IS H)
1.3 pF
Output:° P to (G, fS, H)
2.4 pF
Plate to cathode
0.12 pF
Heater to cathode
2.8 pF
PublishedColumn1
Plate of unit No.l to plate of unit No
2 pF
PublishedColumn1
Plate of unit No.l to plate of unit No
0.02 pF
PublishedColumn2
unit No
1 pF
PublishedColumn1
unit No
0.04 pF
PublishedColumn2

Characteristics

Plate Current
10 mA
Ef =
6.3 V
C E{'=
6.3 V

Other

Cathode Current
22 mA
a This racing may be as high as
300 V

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater Voltage (ac/dc) 4.2
6.3 V
Published in approved 6BZ8 target datasheet entry; Section1
Heater Current 0.6
400 mA
Published in approved 6BZ8 target datasheet entry; Section1
Cathode Current
22 mA
Published in approved 6BZ8 target datasheet entry; Section1
Plate Dissipation
2.2 W
Published in approved 6BZ8 target datasheet entry; Section1
Cathode-Bias Resistor
220 Ω
Published in approved 6BZ8 target datasheet entry; Section1
Plate Resistance (Approx.)
5300 Ω
Published in approved 6BZ8 target datasheet entry; Section1
Plate Current
10 mA
Published in approved 6BZ8 target datasheet entry; Section1
Grid Voltage (Approx.) for transconductance of
50 µS
Published in approved 6BZ8 target datasheet entry; Section1
Grid Voltage (Approx.) for transconductance of 50 /imhos
-13 V
Published in approved 6BZ8 target datasheet entry; Section1

Capacitance

Grid to Plate 1.2
1.2 pF
Published in approved 6BZ8 target datasheet entry; Section1
Plate to Grid, Heater, and Internal Shield
2.4 pF
Published in approved 6BZ8 target datasheet entry; Section1
Plate to Cathode
0.12 pF
Published in approved 6BZ8 target datasheet entry; Section1
Heater to Cathode 2.8
2.8 pF
Published in approved 6BZ8 target datasheet entry; Section1