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7499

Rugged nine-pin all-glass pentode designed for video-amplifier applications. Special electrode, cathode, heater, and glass construction reduce catastrophic failure and support long cutoff periods, frequent heater switching, and low leakage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 750 mA

Description

The 7499 is a nine pin all glass construction pentode for use in video arplifier spplications. The use of a special rugged electrode construction manufactured by means of semi-autonatic assembly techniques contributes to a low catastrophic failure rote, The cathode sleeve is made of a specizl alloy to inhibit the growth of cathode interface resistance during long pericds of operation under cut-off conditions and the pure tungsten heater has been designed to withstand frequent heater switching (see note), In addition, the heater-cathode construction and materials ensure very low levels of The glass base and envelope strain patterns are tightly controlled during monufacture to prevent glass failures during life,

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: 750 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

Max plate voltage: 300 V
Max plate dissipation: 12 W
Max screen dissipation: 2.5 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

Pentode

Characteristic

voltage 120% of nominal value: heater—cathode voltage 240V r.m.s
240 V
voltage 120% of nominal value: heater—cathode voltage 240V r.m.s
Voltage (ac or de) 6,3 volts
6.3 V
Voltage (ac or de) 6,3 volts
Current 0.75 amps,
750 mA
Current 0.75 amps,
Moximm anode VOLtaZe evvsevvieseesvovocenosssnesneresass 300 vOlts
300 V
Moximm anode VOLtaZe evvsevvieseesvovocenosssnesneresass 300 vOlts
Anode current 30 L0 50 mA
50 mA
Anode current 30 L0 50 mA
Anode current at Vgl = = 25V 10 ua
25 V
Anode current at Vgl = = 25V 10 ua

Other

Maxirmm anode voltage (Iam0) vevevurveneessvsassocanesess 500 volts
500 V
Maxirmm anode voltage (Iam0) vevevurveneessvsassocanesess 500 volts
Maxdmum anode Alssipation c...evevseseveeee seevenneness. 12 watts
12 W
Maxdmum anode Alssipation c...evevseseveeee seevenneness. 12 watts
Maximum screen voltage (Igo=0) ovevvveerrevnenienennnans, 500 volts
500 V
Maximum screen voltage (Igo=0) ovevvveerrevnenienennnans, 500 volts
Maxirum soreen dissipation voveer viiiviinnirennnennenns 2.5 watts
2.5 W
Maxirum soreen dissipation voveer viiiviinnirennnennenns 2.5 watts