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7500

Special reliable all-glass beam tetrode engineered for low catastrophic failure, long cutoff operation, frequent heater switching, and controlled mechanical construction.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

The 7500 is a nine pin all glass construction beam tetrode for The use of a special rugped electrode construction manufactured by means of semi~automatic assembly technigues contributes to a low catastrophic failure rate. The cathode sleeve is made of a specisl alloy to inhibit the growth of cathodeinterface resistance during long periods of operation under cut-off conditions and the pure tungsten heater has been designed to withstand frequent heater switching (see note)s In addition the heater-cathode construction and materials ensure very low levels of The glass base and envelcpe strain patterns are tightly contrelled during manufacture to prevent glass failures during life. Special

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: -
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

Beam Power

X-ray radiationInterelectrode capacitances

Amplification factor: 7
Max plate voltage: 390 V
Max screen voltage: 310 V
Max plate dissipation: 13.2 W
Max screen dissipation: 2 W

Primary electrical section; identical repeated sections compressed where applicable.

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

1954 STC Brimar

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

noninal value: heater—cathode voltage 240V r.m.s: applied voltages
240 V
noninal value: heater—cathode voltage 240V r.m.s: applied voltages
Voltage (ac or dc) 6.3 volts
6.3 V
Voltage (ac or dc) 6.3 volts
Heater negative with respect to cathode s.v.evce. 90 volts
90 V
Heater negative with respect to cathode s.v.evce. 90 volts
Mutual conducteonce 3.0 Yat 5.2 w/V.
5.2 W
Mutual conducteonce 3.0 Yat 5.2 w/V.