Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Heater Current
90 mA
Nominal published value
Voltage - Dual Triode (similar) ·Triode-Triode
7889
Reliable rugged subminiature twin triode intended for amplifier and control applications in severe environments, combining compact construction with dependable electrical performance.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 80G
- Socket code
- B8D
- Base pins
- 8
- Nominal heater
- 26.5 V / 90 mA
Description
A premium subminiature general-purpose medium-mu dual triode with separate cathodes, particularly useful in low-level audio applications and designed for dependable operation.
Socket description
Subminiature 8-lead
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 80G
- Socket code
- B8D
- Base pins
- 8
- Nominal heater voltage
- 26.5 V
- Nominal heater current
- 90 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
80G - 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
- 70
- Max plate voltage
- 165 V
- Max plate dissipation
- 0.55 W
Primary physical section. Sylvania 7889: maximum DC plate voltage 165 V; peak forward plate voltage 330 V. Typical transconductance 2500 µmhos and amplification factor 70 at 150 V plate voltage, 820 Ω cathode resistor.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0025 S
- Amplification factor
- 70
- Max plate voltage
- 165 V
- Max plate dissipation
- 0.55 W
Second physical section. Sylvania 7889: maximum DC plate voltage 165 V; peak forward plate voltage 330 V. Typical transconductance 2500 µmhos and amplification factor 70 at 150 V plate voltage, 820 Ω cathode resistor.
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.