Tube-number record

CK7570/QK411A

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BrandRaytheon

ClassRecording Storage Tube

BaseDiheptal

Filament6.3 V @ 600 mA

Construction

Primary TypeDisplay / CRT

EnvelopeGlass

SectionsSingle

Filament / Heater

Heater Notes6.3 V +10%

Absolute Maximum Ratings

Plate Voltage6000 V

Grid 2 Voltage6000 V

Grid 1 Voltage-200 V

H-C Voltage150 V

Audio Performance

Key Features

Repeating information stored for many hours up to 30,000 times
Electrostatic focusing
Electrostatic deflection
Similar to CK6835/QK464A

Typical Operation

Mode	Plate V	Gm (µmhos)	Rp (Ω)	µ	Plate mA
Prime	5000 V	—	—	—	0.15 mA
Read	5000 V	—	—	—	0.002 mA
Write	5000 V	—	—	—	—

Application Notes

Priming is accomplished by uniformly charging the storage surface. Reading involves using a low cathode current of about 2 uA. Erasing is performed by writing a dc signal into the tube.

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