Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
CounterSelectorSwitch
Other
Anode supply voltage maximum
800 V
Specialized - Switching Tube ·CounterSelectorSwitch
6879
Cold-cathode decimal counting and selector tube that advances a glow discharge among numbered cathodes in response to guide-electrode pulses.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- 9AD
- Socket code
- B7G
- Base pins
- 9
- Nominal heater
- 6.3 V / 150 mA
Description
Miniature cold-cathode decimal counting/selector tube with selected output cathodes brought to base pins.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 9AD
- Socket code
- B7G
- Base pins
- 9
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 150 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
9AD - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1G1 | A | G1 — Control Grid Chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9AD |
| PIN3K | A | K — Cathode Source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9AD |
| PIN4H | — | H — Heater Chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9AD |
| PIN5H | — | H — Heater Chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9AD |
| PIN7G2 | A | G2 — Screen Grid Chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9AD |
| PIN8P | A | P — Plate (Anode) Chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9AD |
| PIN9G3 | A | G3 — Suppressor Grid Chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9AD |
Section ratings
1 physical section, each with unique specifications.
Section 1
CounterSelectorSwitch
X-ray radiationInterelectrode capacitances
- Plate resistance
- 13700 Ω
- Transconductance
- 0.00153 S
- Amplification factor
- 21
- Max plate voltage
- 300 V
- Max screen voltage
- 150 V
- Regulator maximum current
- 0.6 mA
Published maximum ratings, representative operating conditions, and available capacitance/rectifier data reviewed.
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 02
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
CounterSelectorSwitch
Other
Maximum plate voltage
300 V
Published handbook rating
Maximum screen voltage
150 V
Published handbook rating
Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Control-grid bias
8 V
ClassA
Plate current
5.5 mA
ClassA
Triode-connected plate voltage
250 V
TriodeConnection ClassA
Triode-connected control-grid bias
18 V
TriodeConnection ClassA
Triode-connected plate current
53 mA
TriodeConnection ClassA
Triode-connected screen current
2.5 mA
TriodeConnection ClassA
Triode-connected load resistance
4200 ohm
TriodeConnection ClassA
Triode-connected power output
11.3 W
TriodeConnection ClassA
Characteristic
Plate resistance
13700 ohm
Published handbook characteristic
Transconductance
1530 µS
Published handbook characteristic
Amplification factor
21
Published handbook characteristic
Heater/filament voltage
6.3 V
Published heater/filament rating
Heater/filament current
150 mA
Published heater/filament rating
Triode-connected plate resistance
48000 ohm
TriodeConnection
Triode-connected transconductance
5200 µS
TriodeConnection
Data set 03
1965 Sylvania Electronic Tubes Vol3
Published operating points and test conditions from this source.
SECTION 1
CounterSelectorSwitch
Other
Anode supply voltage minimum
350 V
Anode supply voltage maximum
800 V
Anode current
0.6 mA
Pulse repetition maximum
5 kpps
Pulse
Typical anode supply voltage
350 V
Nominal tube drop
187 V
Guide bias minimum
35 V
Square pulse drive amplitude minimum
-75 V
Pulse
Square double-pulse width minimum
60 us
Pulse
Forced reset pulse amplitude minimum
-120 V
Pulse
Forced reset pulse width minimum
50 us
Pulse
Cathode load resistance maximum
150 kohm
Characteristics
Transfer voltage
140 V
Application
Application
Decimal pulse counter / selector