DSPEN

Cossor pentode documented with complete construction, technical, and operating information. Its placement in this remote-cutoff population is retained conservatively, as the available extracted description does not independently expose stronger application wording.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B7
Base pins: 7
Nominal heater: 16 V / 250 mA

Description

DSPEN: Cossor pentode valve. The complete Cossor sheet was read for construction, technical data, operating recommendations, and application notes.

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: 16 V
Nominal heater current: 250 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

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.002 S

Published ratings/characteristics promoted from the approved datasheet.

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

1936 Cossor Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater/filament voltage
16 V
Heater/filament current
250 mA
Control characteristic
Variable-mu
Intended service
High-frequency amplifier

Data set 02

193X Cossor

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Mutual Conductance
200000 µS
Published technical-data value