Voltage Pentode - Remote Cutoff (single) ·Pentode
Single-ended Lock-In remote-cutoff pentode for RF or IF service in AC, AC/DC, and automobile receivers. Its variable-mu characteristic provides controlled gain across diverse receiver power systems.
A single-ended remote-cutoff RF pentode of Lock-In design for RF or IF service in AC, AC/DC, and automobile receivers.
Loctal 8-contact
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 |
|---|---|---|---|
| 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 |
1 physical section, each with unique specifications.
Section 1
Published promoted fields populated by semantic heading; identical repeated physical sections compressed.
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.
Anode Voltage
250 V
Anode Current
8.5 mA
Screen Voltage
100 V
Screen Current
2 mA
Control Grid Voltage
-3 V
Cathode Bias Resistor
300 ohm
Control Grid Voltage for Low Transconductance
-40 V
Transconductance=0.005mA/V
Data set 02
Published operating points and test conditions from this source.
HeaterVoltageNominal
7 V
Nominal
HeaterCurrentNominal
160 mA
Nominal
Plate Voltage
250 V
ClassA
Screen Voltage
100 V
ClassA
Data set 03
Published operating points and test conditions from this source.
Cutoff characteristic
Variable-mu
Data set 04
Published operating points and test conditions from this source.
Input capacitance
5 pF
Section1
Output capacitance
6 pF
Section1
Grid-to-plate capacitance
0.004 pF
Section1
Typical plate voltage
250 V
ClassA
Typical screen voltage
100 V
ClassA
Typical grid voltage
-3 V
ClassA
Typical plate current
8.5 mA
ClassA
Typical screen current
1.7 mA
ClassA
Plate resistance
750000 Ohm
Section1
Transconductance
1750 uS
Section1
Data set 05
Published operating points and test conditions from this source.
Grid To Plate Capacitance
0.007 pF
Maximum
Transconductance
1750 uS
Typical