Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Heater Current
45 mA
Nominal published value
Voltage - Triode (single high frequency) ·Triode
7888
Premium subminiature high-transconductance medium-mu triode intended primarily as a UHF oscillator and also suitable for lower-frequency applications.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 8DK
- Socket code
- B8D
- Base pins
- 8
- Nominal heater
- 26.5 V / 45 mA
Description
A premium subminiature high-transconductance medium-mu triode intended primarily as a UHF oscillator and also suitable for lower-frequency applications.
Socket description
Subminiature 8-lead
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 8DK
- Socket code
- B8D
- Base pins
- 8
- Nominal heater voltage
- 26.5 V
- Nominal heater current
- 45 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
8DK - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1G1 | A | G1 — Control Grid EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DK |
| PIN3H | — | H — Heater EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DK |
| PIN5K | A | K — Cathode EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DK |
| PIN6H | — | H — Heater EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DK |
| PIN8P | A | P — Plate (Anode) EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DK |
Section ratings
1 physical section, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0065 S
- Amplification factor
- 27
- Max plate voltage
- 165 V
- Max plate dissipation
- 3.3 W
Primary physical section. Sylvania 7888: maximum DC plate voltage 165 V; peak forward plate voltage 330 V. Typical transconductance 6500 µmhos and amplification factor 27 at 150 V plate voltage, 180 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.