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7788

Premium-quality high-transconductance pentode specified for a 10,000-hour service life. Amperex documentation emphasizes extended professional reliability together with substantial transconductance for demanding signal-amplifier applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 340 mA

Description

7788 is a Pentode device in the supplied Amperex literature. Premium-quality 10,000-hour high-transconductance pentode.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 340 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: 0.05 S
Max plate voltage: 250 V
Max screen voltage: 200 V
Max plate dissipation: 5 W
Max cathode current: 50 mA

Premium-quality 10,000-hour high-transconductance pentode.

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 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Input capacitance
16.5 pF
Output capacitance
3.3 pF

Other

Cathode resistor
360 ohm
Anode current
35 mA
Screen current
5 mA

Characteristic

Transconductance
50000 uS
Amplification factor
60