Data set 01
1953 RFT Rundfunk Technik
Published operating points and test conditions from this source.
SECTION 2
Tetrode
Other
Power Output
4 W
ClassA;OneTube;Plate 200 V;Screen 200 V
Power - Tetrode (NOT beam) ·Tetrode-Triode
UCL11
Combination high-gain triode and power-output tetrode for audio-frequency equipment. The triode supplies voltage amplification while the larger tetrode section provides roughly 4 W Class A loudspeaker output, integrating successive audio stages in one envelope.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- Y8A
- Base pins
- -
- Nominal heater
- 62 V / 100 mA
Description
The UCL11 combines a small-signal triode with a power output tetrode in one envelope. Its ratings and operating data support voltage amplification followed by a several-watt audio output stage.
Socket description
Steel-tube 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- Y8A
- 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
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0016 S
- Amplification factor
- 66
- Max plate voltage
- 250 V
- Max plate dissipation
- 0.6 W
Triode section.
Section 2
Tetrode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 18000 Ω
- 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.
Data set 02
1957 Philips Receiving and Amplifying Tubes
Published operating points and test conditions from this source.
SECTION 2
Tetrode
Characteristic
Application
Audio output stage
Other
Power Output
4 W
Representative published ClassA point
Data set 03
1959 Telefunken
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Plate voltage
200 V
Section1
Grid bias
-2 V
Section1
Plate current
2.5 mA
Section1
Capacitance
Input capacitance
5.3 pF
Section1
Grid-plate capacitance
1.5 pF
Section1
SECTION 2
Tetrode
Other
Plate voltage
200 V
Section2
Screen voltage
200 V
Section2
Plate current
40 mA
Section2
Output power
4.2 W
Section2;Approximate
Maximum screen dissipation under drive
3 W
Section2