Data set 01
1938 Raytheon
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Application
HighFrequencyAmplifier text
Voltage Pentode - Sharp Cutoff (single) ·Pentode
7T7
Sharp-cutoff pentode designed for RF, IF, wide-band, or high-frequency voltage-amplifier service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 8V
- Socket code
- B8G
- Base pins
- 8
- Nominal heater
- 6.3 V / 300 mA
Description
Sharp-cutoff pentode for high-frequency amplification in radio receivers.
Socket description
Loctal 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 8V
- Socket code
- B8G
- Base pins
- 8
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
8V - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1H | — | H — Heater EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN2P | A | P — Plate (Anode) EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN3G2 | A | G2 — Screen Grid EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN4G3 | A | G3 — Suppressor Grid EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN5IS | A | IS — Internal Screen EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN6G1 | A | G1 — Control Grid EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN7K | A | K — Cathode EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
| PIN8H | — | H — Heater EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 8V |
Section ratings
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 900000 Ω
- Transconductance
- 0.0049 S
- Max plate voltage
- 300 V
- Max screen voltage
- 150 V
- Max plate dissipation
- 3 W
- Max screen dissipation
- 0.7 W
Sharp-cutoff RF pentode section.
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
Pentode
Capacitance
Input capacitance
7.5 pF
Output capacitance
5.5 pF
Grid-to-plate capacitance
0.005 pF
Other
Plate voltage
250 V
ClassA
Screen-grid voltage
150 V
ClassA
Grid voltage
-1 V
ClassA
Plate current
10.8 mA
ClassA
Screen-grid current
4.1 mA
ClassA
Characteristic
Plate resistance
900000 ohm
ClassA
Transconductance
4900 uS
ClassA