6LD20

Double-diode medium-mu triode for detector, rectifier, and voltage-amplifier service. Two diodes provide complementary rectification while the relatively low-resistance triode offers stronger current drive than high-mu detector triodes.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: B8A
Socket code: -
Base pins: 8
Nominal heater: 6.3 V / 250 mA

Description

Double-diode triode with common cathode for detector/rectifier and voltage-amplifier service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: B8A
Socket code: -
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 250 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

B8A - 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.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Section 3

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 9300 Ω
Transconductance: 0.0034 S
Amplification factor: 31.5
Max plate voltage: 250 V
Max cathode current: 5 mA

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

Triode

Other

MaximumMeanDiodeCurrentPerDiode
0.1 mA
Maximum Heater Cathode Voltage
150 V

Capacitance

TriodeAnodeEarthCapacitance
3.7 pF
TriodeAnodeGridCapacitance
1.5 pF
TriodeGridEarthCapacitance
3.6 pF