Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Heater Voltage
6.3 V
Other
OperationalAltitude
60000 ft
Voltage - Dual Triode (similar) ·Triode-Triode
7244
Special-quality twin triode designed for reliable long-life amplifier and control service, with rugged construction suited to demanding professional or industrial equipment.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 7BF
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 6.3 V / 100 mA
Description
Reliable medium-mu double triode with frame-grid construction, long life, and stable performance.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7BF
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 100 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
7BF - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN12P | B | P — Plate (Anode) EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN21P | A | P — Plate (Anode) EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN3H | — | H — Heater EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN4H | — | H — Heater EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN51G1 | A | G1 — Control Grid EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN62G1 | B | G1 — Control Grid EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN7K | A | K — Cathode EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 300 V
- Max plate dissipation
- 1.1 W
- Max cathode current
- 12.5 mA
Published ratings and characteristics promoted from the supplied Sylvania source.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 300 V
- Max plate dissipation
- 1.1 W
- Max cathode current
- 12.5 mA
Second physical triode restored.
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.