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
Power - Pentode Single (NOT beam) (under 10W) ·Pentode
329A
Power/output pentode designed for Class-A, single-ended, or push-pull audio-frequency output amplification.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- UX5
- Base pins
- 5
- Nominal heater
- 7.5 V / 850 mA
Description
General-purpose heater-cathode pentode with higher current capability.
Socket description
Small 5-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- UX5
- Base pins
- 5
- Nominal heater voltage
- 7.5 V
- Nominal heater current
- 850 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
- 50000 Ω
- Transconductance
- 0.0029 S
- Amplification factor
- 146
- Max plate voltage
- 180 V
- Max screen voltage
- 150 V
- Max plate dissipation
- 9 W
- Max screen dissipation
- 1.8 W
- Max cathode current
- 60 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
0.29 pF
Control grid to heater/cathode/screen grid
8 pF
Plate to heater/cathode/screen grid
9 pF
Other
Maximum direct screen-grid current
12 mA
Characteristic
Typical plate current
31 mA
PlateVoltage=180V;ScreenGridVoltage=135V;ControlGridVoltage=-15V