AC2PENDD

Mazda combination tube containing two detector/AVC diodes and an indirectly heated output pentode on a common cathode sleeve. It integrates radio detection, automatic-volume-control, and audio power-output functions.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: -
Base pins: 7
Nominal heater: 4 V / 2 A

Description

Mazda AC2/PEN.DD combines two detector/AVC diodes with an indirectly heated output pentode on a common cathode sleeve. The pentode is rated for 250 V anode and screen operation.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 7
Nominal heater voltage: 4 V
Nominal heater current: 2 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.

Detector/AVC diode on common cathode sleeve.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Detector/AVC diode on common cathode sleeve.

Section 3

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.008 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 10 W

Output pentode 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 01

1960 Mazda

Published operating points and test conditions from this source.

SECTION 3

Pentode

Other

Anode voltage
250 V
Screen voltage
250 V
Grid bias
-5.3 V
Anode current
32 mA
Screen current
6 mA
Optimum load resistance
6700 ohm
Self-bias resistance
140 ohm
Maximum undistorted power output
3.5 W
Input swing RMS
3.2 V