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Voltage Pentode - Sharp Cutoff (single) ·Pentode

19HS6

Sharp-cutoff high-transconductance pentode for RF and IF voltage amplification, using an 18.9 V heater for series-string equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
18.9 V / 300 mA

Description

19HS6 — Sharp-Cutoff Pentode

The 19HS6 is a sharp-cutoff pentode of the 7-pin miniature type. It is designed primarily for use as an intermediate-frequency (IF) amplifier in electronic equipment. Electrically, the 19HS6 is identical to the 6HS6 except for its heater characteristics and associated ratings.

Heater Characteristics and Ratings

The 19HS6 features a heater designed for series-string or specific voltage-source operation, with a controlled warm-up time.

  • Heater Voltage (AC or DC): 18.9 V (at 0.150 A)
  • Heater Current: 0.150 ± 0.010 A (150 mA)
  • Average Warm-up Time: 17 seconds

Heater-Cathode Voltage Limits

To ensure reliable operation and prevent insulation breakdown, the voltage between the heater and the cathode must be maintained within the following absolute limits:

  • Heater Negative with Respect to Cathode: 200 V maximum (Total DC and Peak)
  • Heater Positive with Respect to Cathode (DC): 100 V maximum
  • Heater Positive with Respect to Cathode (Total DC and Peak): 200 V maximum

Mechanical Specifications and Basing

The tube is constructed in a compact glass envelope with a standard miniature base configuration.

  • Envelope Type: Miniature T-5½
  • Base: Button 7-Pin, E7-1
  • Basing Diagram: 7BK
  • Outline Designation: 5-2
  • Maximum Diameter: 0.750 inches
  • Maximum Seated Height: 1.875 inches
  • Maximum Overall Height: 2.125 inches

Direct Interelectrode Capacitances

The direct interelectrode capacitances of the 19HS6 are measured without an external shield (unshielded):

ConnectionCapacitance
Grid No. 1 to Plate (Max.)0.006 pF
Grid No. 1 to Cathode, Grid No. 3, Internal Shield, Grid No. 2, and Heater8.8 pF
Plate to Cathode, Grid No. 3, Internal Shield, Grid No. 2, and Heater5.2 pF

Maximum Ratings (Design Maximum Rating System)

The following maximum ratings are established under the Design Maximum Rating System for Class A1 amplifier service. Operating the tube beyond these limits may impair performance or cause permanent damage.

  • Plate Supply Voltage (Max.): 300 V
  • Grid No. 3 (Suppressor Grid): Must be connected to the cathode at the socket.
  • Grid No. 2 (Screen Grid) Supply Voltage (Max.): 300 V
  • Grid No. 2 Voltage: Refer to standard rating charts for specific voltage limits.
  • Grid No. 1 (Control Grid) Positive Bias Voltage (Max.): 0 V
  • Grid No. 1 (Control Grid) Negative Bias Voltage (Max.): 50 V
  • Plate Dissipation (Max.): 3 W
  • Grid No. 2 Input (Max., for Grid No. 2 voltages up to 150 V): 1 W
  • Grid No. 2 Input (for Grid No. 2 voltages between 150 V and 300 V): Refer to standard rating charts.
  • Maximum Grid No. 1 Circuit Resistance (Fixed Bias): 0.5 MΩ
  • Maximum Grid No. 1 Circuit Resistance (Cathode Bias): 1 MΩ

Typical Operation and Characteristics

The 19HS6 can be operated under different Class A1 amplifier conditions depending on the application requirements. The following typical operating points illustrate its performance:

ParameterCondition 1Condition 2
Plate Supply Voltage75 V150 V
Grid No. 3 (Suppressor Grid)Connected to cathodeConnected to cathode
Grid No. 2 Supply Voltage75 V75 V
Grid No. 1 Supply Voltage0 V0 V
Cathode Bias Resistor68 Ω68 Ω
Amplification Factor50—
Plate Resistance (Approx.)—0.5 MΩ
Transconductance—9500 µmhos
Plate Current—8.8 mA
Grid No. 2 Current—2.8 mA

Under Condition 2, the control grid (Grid No. 1) voltage required to reduce the plate current to approximately 20 µA is -4 V.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9A
Base pins
9
Nominal heater voltage
18.9 V
Nominal heater current
300 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
350000 Ω
Transconductance
0.009 S
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
3 W
Max screen dissipation
0.75 W
Max cathode current
25 mA

6HS6 sharp-cutoff electrical system.

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 01

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage

    18.9 V

  • Heater current

    300 mA

  • Heater warm-up time

    11 s

    ControlledWarmup

  • Plate voltage

    150 V

    ClassA

  • Screen voltage

    100 V

    ClassA

  • Plate current

    10 mA

    ClassA

  • Screen current

    3 mA

    ClassA

  • Maximum plate voltage

    300 V

  • Maximum screen voltage

    150 V

Characteristic

  • Plate resistance

    350000 ohm

    ClassA

  • Transconductance

    9000 uS

    ClassA

Capacitance

  • Grid-to-plate capacitance

    0.01 pF