Voltage Pentode - Remote Cutoff (single) ·Pentode
Remote- or semi-remote-cutoff pentode designed for RF, IF, variable-mu, or controlled-gain amplifier service.
Subminiature semi-remote-cutoff pentode designed for controlled-gain amplifier service, with rugged special-quality testing.
Subminiature 8-lead
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1G1 | A | G1 — Control Grid EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DL |
| PIN2G3 | A | G3 — Suppressor GridGroup 8DL2 EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DL |
| PIN2K | A | K — CathodeGroup 8DL2 EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DL |
| PIN3H | — | H — Heater EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DL |
| PIN4G3 | A | G3 — Suppressor GridGroup 8DL4 EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DL |
| PIN4K | A | K — CathodeGroup 8DL4 EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DL |
| PIN5P | A | P — Plate (Anode) EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DL |
| PIN6H | — | H — Heater EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DL |
| PIN7G2 | A | G2 — Screen Grid EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DL |
| PIN8G3 | A | G3 — Suppressor GridGroup 8DL8 EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DL |
| PIN8K | A | K — CathodeGroup 8DL8 EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DL |
1 physical section, each with unique specifications.
Section 1
Promoted from clearly identified printed ratings/characteristics; additional published operating points, capacitances, and specialized ratings retained in TUBE_SECTION_PARAMETER.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
150 mA
Nominal
Maximum Plate Voltage
165 V
Maximum Plate Dissipation
0.85 W
Maximum Cathode Current
20 mA
Transconductance
4500 µS
Typical
Plate Resistance
175000 ohm
Typical
Data set 02
Published operating points and test conditions from this source.
Heater Voltage
6.3 V
Heater Current
150 mA
Data set 03
Published operating points and test conditions from this source.
Input capacitance
4.2 pF
Section1
Output capacitance
3.4 pF
Section1
Grid-to-plate capacitance
0.015 pF
Section1
Plate voltage
100 V
ClassA
Screen voltage
100 V
ClassA
Cathode resistor
120 Ω
ClassA
Plate current
7.2 mA
ClassA
Screen current
2 mA
ClassA
Plate resistance
260000 Ω
ClassA
Transconductance
4500 µS
ClassA
Data set 04
Published operating points and test conditions from this source.
HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
150 mA
Plate Voltage
100 V
Screen Voltage
100 V
Grid Voltage
-1.1 V
Plate Current
7.2 mA
Screen Current
2 mA
Transconductance
4500 uS
PlateToGridCapacitanceMax
0.015 pF
Input Capacitance
4.3 pF
Output Capacitance
3.4 pF
Data set 05
Published operating points and test conditions from this source.
Heater voltage
6.3 V
Heater current
150 mA
Plate voltage
100 V
ClassA
Screen voltage
100 V
ClassA
Cathode bias resistor
120 ohm
ClassA
Plate current
7.2 mA
ClassA
Screen current
2 mA
ClassA
Maximum plate voltage
165 V
Maximum screen voltage
155 V
Maximum plate dissipation
0.75 W
Maximum screen dissipation
0.35 W
Maximum cathode current
16.5 mA
Grid1-to-plate capacitance maximum
0.03 pF
Input capacitance
4 pF
Output capacitance
1.9 pF
Data set 06
Published operating points and test conditions from this source.
Plate-to-Grid Capacitance
<15 mpF
PublishedCapacitance
Input Capacitance
4.3 pF
PublishedCapacitance
Output Capacitance
3.4 pF
PublishedCapacitance
Plate Voltage
100 V
PublishedCharacteristics
Screen Voltage
100 V
PublishedCharacteristics
Control Grid Voltage
-1.1 V
PublishedCharacteristics
Plate Current
7.2 mA
PublishedCharacteristics
Screen Current
2 mA
PublishedCharacteristics
Transconductance
4500 uS
PublishedCharacteristics
Plate Resistance
>175 kohm
PublishedCharacteristics
Transconductance at -15.5 V Grid
25 uS
PublishedCharacteristics
Plate Supply Voltage
330 V
AbsoluteRatings
Plate Voltage
165 V
AbsoluteRatings
Plate Dissipation
0.75 W
AbsoluteRatings
Screen Supply Voltage
310 V
AbsoluteRatings
Screen Voltage
155 V
AbsoluteRatings
Screen Dissipation
0.35 W
AbsoluteRatings
Cathode Current
16.5 mA
AbsoluteRatings
Heater-Cathode Voltage
200 V
AbsoluteRatings
Data set 07
Published operating points and test conditions from this source.
Plate Voltage
100 V
ClassA
Screen Voltage
100 V
ClassA
Plate Current
7.2 mA
ClassA
Screen Current
2 mA
ClassA
Data set 08
Published operating points and test conditions from this source.
Anode current
7.2 mA
Typical
Screen current
2 mA
Typical
Anode-screen-cathode-heater capacitance
3.4 pF
Interelectrode
Grid1-screen-cathode-heater capacitance
4.2 pF
Interelectrode