Tube-number record

8A1

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BrandBrimar

ClassR.F. Screened Pentode

BaseDecal

Filament4 V @ 1000 mA

Construction

Primary TypePentode

EnvelopeGlass

Base MaterialPlastic/Glass

SectionsSingle

Filament / Heater

Heater NotesIndirectly heated

Absolute Maximum Ratings

Plate Voltage250 V

Grid 2 Voltage100 V

Grid 1 Voltage-200 V

Cathode Current6 mA

H-C Voltage180 V

Audio Performance

Key Features

Screened Pentode
Indirectly Heated
Suitable for R.F. circuits
Recommended as anode bend detector

Typical Operation

Mode	Plate V	Gm (µmhos)	Rp (Ω)	µ	Plate mA
R.F. Amplifier	200 V	4000	375000	1500	—
Anode Bend Detector	—	—	250000	—	—

Application Notes

It should only be used in R.F. circuits where the input does not greatly exceed 0.5 volts. As an anode bend detector, a cathode bias resistor of 8,000 ohms is recommended with a screen voltage of 60V and anode resistor of 0.25 megohms. Heater-cathode insulation is high enough for cathode coupling.

Datasheets

Datasheet: 8A1.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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