Data set 01
1958 Mullard Receiving Tubes
Published operating points and test conditions from this source.
SECTION 2
Pentode
Other
Plate Voltage
250 V
ClassA
Screen Voltage
250 V
ClassA
Plate Current
36 mA
ClassA
Power Output
4.3 W
ClassA
Power - Pentode (NOT beam) ·Diode-Diode-Pentode
PEN4DD
Combination double-diode output pentode integrating detector or AVC diode functions with an audio power-output pentode.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 3
- Base
- -
- Socket code
- B7
- Base pins
- 7
- Nominal heater
- 4 V / 2.25 A
Description
The Mullard PEN4DD combines two diode sections with an audio output pentode delivering about 4.3 W.
Socket description
Medium 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B7
- Base pins
- 7
- Nominal heater voltage
- 4 V
- Nominal heater current
- 2.25 A
- 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 of two diode sections.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 50000 Ω
- Transconductance
- 0.0095 S
Output pentode section.
Section 3
Diode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this 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.