TDD13C

Double-diode medium-mu triode for detector, AVC, and low-frequency amplification in AC/DC receivers. The paired diodes provide signal and control-voltage rectification while the triode amplifies the recovered audio signal.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: -
Base pins: -
Nominal heater: 13 V / 200 mA

Description

The Mullard TDD13C combines two detector/AVC diodes with a triode for low-frequency amplification.

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: 13 V
Nominal heater current: 200 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

Rectifier peak inverse voltage: 200 V

Representative of two detector diode sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 13500 Ω
Transconductance: 0.002 S
Amplification factor: 27
Max plate voltage: 200 V
Max plate dissipation: 1.5 W
Max cathode current: 100 mA

LF amplifier triode section.

Section 3

Diode

X-ray radiationInterelectrode capacitances

Max plate voltage: 200 V

Physical diode section added during approved section-structure reconciliation.

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 01

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Maximum Diode Anode Voltage
200 V
EachDiode

Characteristics

Cathode-Diode1 Capacitance
2.5 pF
Cathode-Diode2 Capacitance
3.25 pF
Diode1-Diode2 Capacitance
0.3 pF

SECTION 2

Triode

Characteristics

Heater Voltage
13 V
Heater Current
200 mA
Heating Time
60 s
Plate Voltage
200 V
Plate Current
4 mA
Grid Voltage
-5 V
Transconductance
2000 uS
Plate Resistance
13500 ohm
Amplification Factor
27 ratio
Grid-Cathode Capacitance
3.5 pF
Plate-Cathode Capacitance
2.9 pF

Other

Maximum Output Voltage
37 V
ResistanceCoupledAmplifier; Distortion=5Percent
Maximum Plate Voltage
200 V
Maximum Plate Dissipation
1.5 W
Maximum Cathode Current
100 mA