Data set 01
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Plate Resistance
20000 ohm
Typical
Transconductance
6000 uS
Typical
Other
Maximum Signal Power Output
1.5 W
Power - Pentode Single (NOT beam) (under 10W) ·Pentode
40FR5
Seven-pin miniature power pentode designed for audio-frequency power amplification with a controlled-warm-up 100 mA heater. Intended for series-string receiver output stages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 40 V / 100 mA
Description
The 40FR5 is a seven-pin miniature power pentode designed for audio-frequency power-amplifier service with a controlled-warm-up 100 mA heater.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 40 V
- Nominal heater current
- 100 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 20000 Ω
- Transconductance
- 0.006 S
- Max plate voltage
- 150 V
- Max screen voltage
- 130 V
- Max plate dissipation
- 5.2 W
- Max screen dissipation
- 1.2 W
- Rectifier max heater-cathode voltage
- 200 V
- Rectifier warm-up time
- 20 s
Published promoted fields populated by semantic headings; identical repeated sections compressed.
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
1966 Tung Sol Electronic Tubes 3 of 4
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Typical plate voltage
130 V
ClassA
Typical screen voltage
110 V
ClassA
Typical plate current
32 mA
ClassA
Load resistance
2800 ohm
ClassA
Power output
1.5 W
ClassA
Maximum plate voltage
150 V
PromotedValue
Maximum screen voltage
130 V
PromotedValue
Maximum plate dissipation
5.2 W
PromotedValue
Maximum screen dissipation
1.2 W
PromotedValue
Plate Voltage
150 V
PublishedTable
Grid #2 Voltage
130 V
PublishedTable
Plate Dissipation
5.2 W
PublishedTable
Grid #2 Dissipation
1.2 W
PublishedTable
Zero- Signal Plate Current 3L}
32 mA
PublishedTable
Max.- Signal Plate Current 3J
35 mA
PublishedTable
Zero-Signal Grid #2 Current 3.2
3 mA
PublishedTable
Plate Resistance, Approx.
20000 ohm
PublishedTable
Load Resistance 3200
2800 ohm
PublishedTable
Characteristics
Heater warm-up time
20 s
ClassA
Plate resistance
20000 ohm
PromotedValue
Transconductance
0.006 A/V
PromotedValue
Capacitance
Grid-to-plate capacitance
0.3 pF
Input capacitance
12 pF
Output capacitance
9 pF