Data set 01
1963 Hitachi
Published operating points and test conditions from this source.
SECTION 1
Triode
Capacitance
Interelectrode capacitances published
1
See source table
Voltage - Dual Triode (similar) ·Triode-Triode
19RLL1
Long-life twin triode intended for oscillator and amplifier service in wire-communication equipment, providing two similar triode sections for dependable continuous-duty electronic circuitry.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- E9-1
- Socket code
- -
- Base pins
- 9
- Nominal heater
- 19 V / 150 mA
Description
19RLL1 — Medium-Mu Twin Triode
The 19RLL1 (also designated as 19R-LL1) is a multi-purpose, long-life miniature twin triode designed for use in wire communication equipment. It is classified as a medium-mu device and is typically employed in oscillator and amplifier applications.
A notable operating constraint of the 19RLL1 is that it is not suitable for applications where the heater circuit is subjected to frequent "On and Off" switching.
Mechanical Specifications and Pinout
The 19RLL1 is constructed in a T6 1/2 glass envelope and utilizes an E9-1 Small Button Noval 9-pin base. The tube can be mounted and operated in any position.
Physical Dimensions
- Maximum Diameter: 7/8 inch
- Maximum Overall Height: 2-3/16 inches
- Maximum Seated Height: 1-15/16 inches
Pin Connections
The 9-pin base layout provides separate connections for the two triode units, along with an internal shield. The pinout configuration is as follows:
| Pin | Connection |
|---|---|
| Pin 1 | Heater (H) |
| Pin 2 | Cathode (Unit 2) (Kt2) |
| Pin 3 | Grid (Unit 2) (Gt2) |
| Pin 4 | Plate (Unit 2) (Pt2) |
| Pin 5 | Internal Shield (IS) |
| Pin 6 | Plate (Unit 1) (Pt1) |
| Pin 7 | Grid (Unit 1) (Gt1) |
| Pin 8 | Cathode (Unit 1) (Kt1) |
| Pin 9 | Heater (H) |
Heater and Absolute Maximum Ratings
The heater is designed for series or dedicated supply operation with a relatively high nominal voltage and low current draw.
Heater Specifications
- Heater Voltage: 19.0 V
- Heater Current: 0.15 A
Absolute Maximum Ratings
Operating the tube beyond these limits may impair its long-life characteristics or cause permanent damage:
- Maximum Plate Voltage: 275 V
- Maximum Plate Dissipation: 2.8 W
- Maximum Total Cathode Current: 22 mA
- Maximum Peak Heater-Cathode Voltage (Heater negative with respect to cathode): 100 V
- Maximum Peak Heater-Cathode Voltage (Heater positive with respect to cathode): 100 V
Typical Operating Characteristics
Under typical Class A operating conditions, each triode unit exhibits the following electrical characteristics:
| Parameter | Value |
|---|---|
| Plate Voltage | 120 V |
| Cathode-Bias Resistor | 180 Ω |
| Plate Current | 8.5 mA |
| Transconductance | 5,500 µmhos |
| Plate Resistance (Approx.) | 5.5 kΩ |
| Amplification Factor | 30 |
Direct Interelectrode Capacitances
The direct interelectrode capacitances are measured without an external shield. Both triode units exhibit identical capacitance values:
| Capacitance Parameter | Unit 1 | Unit 2 |
|---|---|---|
| Grid No. 1 to Plate | 1.6 pF | 1.6 pF |
| Input | 2.1 pF | 2.1 pF |
| Output | 1.4 pF | 1.4 pF |
Technical Summary
The 19RLL1 is a specialized, long-life medium-mu twin triode housed in a Noval 9-pin miniature envelope. Featuring a 19.0 V, 0.15 A heater, it is optimized for stable, continuous-duty applications such as oscillators and amplifiers in wire communication equipment. With an amplification factor of 30, a transconductance of 5,500 µmhos, and an internal shield connected to Pin 5, the 19RLL1 provides reliable dual-triode performance under steady-state thermal conditions, provided frequent power cycling of the heater is avoided.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- E9-1
- Socket code
- -
- Base pins
- 9
- Nominal heater voltage
- 19 V
- Nominal heater current
- 150 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
E9-1 - Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 55000 Ω
- Transconductance
- 0.0055 S
- Amplification factor
- 30
- Max plate voltage
- 275 V
- Max plate dissipation
- 2.8 W
- Max cathode current
- 22 mA
Repeated identical physical sections represented by one populated row.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 55000 Ω
- Transconductance
- 0.0055 S
- Amplification factor
- 30
- Max plate voltage
- 275 V
- Max plate dissipation
- 2.8 W
- Max cathode current
- 22 mA
Second physical triode section; electrically identical twin section.
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.