Data set 01
1944 Hytron
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Maximum Frequency
100 MHz
Full ratings
Power - Pentode Single (NOT beam) (under 10W) ·Pentode
3B4
Directly heated instant-start beam-power pentode for portable or mobile RF amplification, oscillation, and frequency multiplication, capable of Class-C output around 100 MHz.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7CY
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 1.25 V / 330 mA
Description
Directly heated power pentode for RF amplification, oscillation and frequency multiplication.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7CY
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 1.25 V
- Nominal heater current
- 330 mA
- Parallel heater voltage
- 1.25 V
- Parallel heater current
- 330 mA
- Series capable
- Yes
7CY - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1G2 | A | G2 — Screen Grid EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CY |
| PIN2G3 | A | G3 — Suppressor GridGroup 7CY2 EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CY |
| PIN2FCT | — | FCT — Filament Center TapGroup 7CY2 EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CY |
| PIN3G1 | A | G1 — Control Grid EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CY |
| PIN4F | — | F — Filament EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CY |
| PIN5F | — | F — Filament EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CY |
| PIN6G3 | A | G3 — Suppressor GridGroup 7CY6 EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CY |
| PIN6FCT | — | FCT — Filament Center TapGroup 7CY6 EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CY |
| PIN7P | A | P — Plate (Anode) EIA chart transcription; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CY |
Section ratings
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0017 S
- Amplification factor
- 4.1
- Max plate voltage
- 150 V
- Max screen voltage
- 135 V
- Max plate dissipation
- 3 W
- Max cathode current
- 25 mA
Published ratings and characteristics promoted where clearly legible in the approved source.
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
Other
Maximum plate voltage
150 V
Published handbook rating
Maximum screen voltage
135 V
Published handbook rating
Plate voltage
150 V
ClassA
Screen voltage
135 V
ClassA
Control-grid bias
38 V
ClassA
Plate current
25 mA
ClassA
Screen current
6.2 mA
ClassA
Power output
1.25 W
ClassA
Characteristic
Heater/filament voltage
1.25 V
Published heater/filament rating
Heater/filament current
330 mA
Published heater/filament rating
Data set 03
195X Raytheon Special Purpose Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
150 V
RFPowerAmplifier
Control-grid voltage
-38 V
RFPowerAmplifier
Screen voltage
135 V
RFPowerAmplifier
Plate current
25 mA
RFPowerAmplifier
Screen current
6.2 mA
RFPowerAmplifier
Power output
1.25 W
100MHz
Data set 04
1968 Mazda Belvu
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Application
RF_Amplifier_Oscillator_FrequencyMultiplier text