Data set 01
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 2
Tetrode
Other
Service
Space-charge-grid audio driver
AutomotiveSupplyVoltage
12.6 V
Voltage Pentode or Tetrode (under 100V) ·Diode-Diode-Tetrode
12DL8
Two-diode space-charge-grid tetrode developed as an automobile-radio audio driver, operating directly from 12.6 V and providing useful drive power at exceptionally low plate voltage.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 3
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 12.6 V / 550 mA
Description
The 12DL8 combines two detector diodes with a high-current space-charge-grid tetrode intended for audio power-amplifier service using a nominal 12-volt automotive battery supply.
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
- 12.6 V
- Nominal heater current
- 550 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
3 physical sections, each with unique specifications.
Section 1
Diode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Representative row for two identical detector diode units.
Section 2
Tetrode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 1140 Ω
- Transconductance
- 0.015 S
- Amplification factor
- 7.2
- Max plate voltage
- 30 V
- Max screen voltage
- 20 V
Space-charge-grid tetrode; control grid is published as grid #2 and space-charge grid as grid #1.
Section 3
Diode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Added approved missing physical diode section row.
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
1966 Tung Sol Electronic Tubes 2 of 4
Published operating points and test conditions from this source.
SECTION 1
Diode
Other
Maximum average diode current
5 mA
EachDiode
Characteristic
Diode current at 10 V applied
3 mA
EachDiode
SECTION 2
Tetrode
Other
Plate voltage
12.6 V
ClassA1
Control grid voltage
-0.5 V
ClassA1
Space-charge grid voltage
12.6 V
ClassA1
Plate current
40 mA
ClassA1
Power output
40 mW
ClassA1
Maximum heater-cathode voltage
30 V
WholeTube