Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 2
Pentode
Application
Primary application
High-fidelity audio preamplifier
Voltage Triode Pentode ·Pentode-Triode
7687
Low-noise triode-pentode for high-fidelity voltage amplification, phase splitting, preamplification, and tone-control service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 6.3 V / 500 mA
Description
Improved low-noise triode-pentode for high-fidelity preamplifier and phase-splitter service.
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
- 500 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
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0025 S
- Amplification factor
- 18
- Max plate voltage
- 330 V
- Max plate dissipation
- 2.4 W
Published source values promoted where applicable; additional source values retained as parameters.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 500000 Ω
- Transconductance
- 0.0058 S
- Max plate voltage
- 330 V
- Max screen voltage
- 330 V
- Max plate dissipation
- 3 W
- Max screen dissipation
- 0.6 W
Published source values promoted where applicable; additional source values retained as parameters.
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
1965 Sylvania Electronic Tubes Vol3
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Heater voltage
6.3 V
Heater current
500 mA
Heater current
500 mA
Triode transconductance
2500 uS
Other
Heater-cathode voltage maximum heater negative
200 V
Heater-cathode voltage maximum heater positive DC
100 V
Heater voltage range
5.7 to 6.9 V
Typical triode plate voltage
215 V
Application
Application
High-fidelity phase inverter / preamplifier
Application
Low-noise phase splitter
Capacitance
Triode grid-to-plate capacitance
2.4 pF
Triode input capacitance
2.2 pF
Triode output capacitance
0.3 pF
SECTION 2
Pentode
Capacitance
Pentode grid1-to-plate capacitance maximum
0.15 pF
Other
Typical pentode plate voltage
220 V
Characteristics
Pentode transconductance
5800 uS
Plate resistance
0.5 Mohm
Application
Application
Low-noise preamplifier pentode