SP61

High-transconductance screened pentode developed primarily for television RF and IF stages, with additional video-output and frequency-changer applications. Its broad television roles make it more versatile than a conventional RF-only pentode.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 600 mA

Description

Screened H.F. pentode for H.F. and I.F. television stages, with additional video-output and frequency-changer applications.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 600 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: 0.0085 S
Max plate voltage: 250 V
Max screen voltage: 250 V

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 1

Pentode

Capacitance

Anode-earth capacitance
5 pF
Grid-earth capacitance
10.75 pF
Anode-grid capacitance
0.003 pF