Tube-number record

Z505S

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ClassSelector Tube

BaseCRT / special base

Construction

Primary TypeOther / special

EnvelopeGlass

SectionsTen main cathodes

Filament / Heater

Absolute Maximum Ratings

Plate Voltage1000 V

Cathode Current1 mA

Audio Performance

Key Features

Bi-directional decade selector
Counting tube
Visual indication
End viewing
Ten main cathodes brought out separately

Typical Operation

Mode	Plate V	Gm (µmhos)	Rp (Ω)	µ	Plate mA
Recommended	300 V	—	—	—	0.8 mA

Application Notes

Designed for visual indication and operation at speeds up to 50 kHz. All voltages are referred to the most positive supply potential to which any main cathode is returned.

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