Data set 01
1932 Cunningham Radio Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Grid-plate capacitance
0.007 pF
Published direct interelectrode capacitance
Voltage Pentode - Remote Cutoff (single) ·Pentode
39
Remote-cutoff RF pentode using a 6.3 V, 0.3 A heater. Designed for variable-gain high-frequency amplification, it is suited to automatic-volume-control stages in radio receivers.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 5F
- Socket code
- UX5
- Base pins
- 5
- Nominal heater
- 6.3 V / 300 mA
Description
39 is listed in the supplied receiving-tube handbook as a remote-cutoff RF pentode. The published heater/filament rating is 6.3 V at 0.3 A.
Socket description
Small 5-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 5F
- Socket code
- UX5
- Base pins
- 5
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
5F - 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
- 1000000 Ω
- Transconductance
- 0.00105 S
- Amplification factor
- 1050
- Max plate voltage
- 250 V
- Max screen voltage
- 90 V
Published ratings and characteristics promoted from the approved datasheet.
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
1937 Raytheon Radio Receiving Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate Voltage
250 V
ClassA
Screen Voltage
90 V
ClassA
Grid Voltage
-3 V
ClassA
Plate Current
5.8 mA
ClassA
Screen Current
1.4 mA
ClassA
Data set 03
193X Cunningham
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Heater/filament voltage
6.3 V
Published nominal
Heater/filament current
300 mA
Published nominal
Transconductance
1050 uS
Published characteristic
Data set 04
1940 RCA
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Heater or filament voltage
6.3 V
Published nominal value
Heater or filament current
300 mA
Published nominal value
Transconductance
1050 µS
Published representative/high operating value
Amplification factor
1050
Published representative/high operating value
Plate resistance
1000000 ohm
Published representative/high operating value
Remote-cutoff transconductance
2 µS
At -42.5 V bias
Other
Application
RF amplifier; IF amplifier; mixer
Published use
Data set 05
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate Voltage
250 V
ClassA
Screen Voltage
90 V
ClassA
Grid Voltage
-3 V
ClassA
Plate Current
5.8 mA
ClassA
Screen Current
1.4 mA
ClassA
Data set 06
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
250 V
ClassA
Screen voltage
90 V
ClassA
Plate current
5.8 mA
ClassA
Characteristic
Transconductance
1050 uS
ClassA
Control grid voltage for transconductance 2 uS
-42.5 V
RemoteCutoff