Data set 01
1953 RFT Rundfunk Technik
Published operating points and test conditions from this source.
SECTION 2
Tetrode
Application
Application
AudioOutput text
Power - Tetrode (NOT beam) ·Tetrode-Tetrode
UEL51
Audio amplifier combination tube containing a small-signal tetrode and a substantially larger output tetrode. It was intended to combine voltage amplification and loudspeaker power output, with the power section rated around 9 W plate dissipation.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 62 V / 100 mA
Description
A dual-tetrode tube combining an input tetrode with a higher-power output tetrode for audio-frequency amplifier service.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater voltage
- 62 V
- Nominal heater current
- 100 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
2 physical sections, each with unique specifications.
Section 1
Tetrode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 300000 Ω
- Transconductance
- 0.0017 S
- Max plate voltage
- 250 V
- Max screen voltage
- 250 V
- Max plate dissipation
- 0.75 W
- Max screen dissipation
- 0.25 W
Input tetrode section.
Section 2
Tetrode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.009 S
- Max plate voltage
- 250 V
- Max screen voltage
- 250 V
- Max plate dissipation
- 9 W
- Max screen dissipation
- 1.5 W
- Max cathode current
- 75 mA
Output tetrode 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.