Data set 01
1956 Western Electric Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Service
General-purpose voltage amplification
Voltage Pentode ·Pentode
328A
Western Electric heater-cathode suppressor-grid pentode designed for general-purpose voltage amplification.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- OCTAL6
- Base pins
- 6
- Nominal heater
- 7.5 V / 425 mA
Description
General-purpose heater-cathode pentode for voltage amplification.
Socket description
Octal 6-contact base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- OCTAL6
- Base pins
- 6
- Nominal heater voltage
- 7.5 V
- Nominal heater current
- 425 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
- 750000 Ω
- Transconductance
- 0.0018 S
- Max plate voltage
- 250 V
- Max screen voltage
- 180 V
- Max plate dissipation
- 2.5 W
- Max screen dissipation
- 0.4 W
- Max cathode current
- 10 mA
Promoted from published limiting conditions and representative published characteristics.
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
2026 Western Electric 300s
Published operating points and test conditions from this source.
SECTION 1
Pentode
Capacitance
Control grid to plate without shield
0.025 pF
WithoutShield
Suppressor grid to plate
12.5 pF
WithoutShield
Plate to heater/cathode/screen grid
2.2 pF
WithoutShield
Control grid to suppressor grid
1.8 pF
WithoutShield
Control grid to heater/cathode/screen grid
4 pF
WithoutShield
Suppressor grid to heater/cathode/screen grid
7.5 pF
WithoutShield
Other
Maximum screen-grid current
2.5 mA