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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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Z729/EF86 vacuum tube outline illustration

Tube-number record

Z729/EF86

0 archive entries

Z729/EF86 is a tube type in the TubeDatabase archive (class: AF Pentode). Recorded specifications: brand M-O Valve Co. Ltd., construction Pentode, socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 1 W. The archive does not yet hold a photographed example of this type.

BrandM-O Valve Co. Ltd.
ClassAF Pentode
BaseNoval (B9A)
Filament6.3 V @ 0.2 mA

Construction

Primary TypePentode
EnvelopeTubular Glass
SectionsSingle

Filament / Heater

Heater NotesIndirectly heated

Absolute Maximum Ratings

Plate Voltage300 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pentode250 V18502000000383 mA
Triode250 V200016500334 mA

Application Notes

The Z729 is suitable for use in low level low frequency amplifiers, measuring instruments, and industrial control circuits. Low grid current makes it useful in circuits requiring high input impedance.

Filters

0 tubes found

Manufacturers

Brands

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    Plate Dissipation1 W
    Grid 2 Voltage250 V
    Cathode Current8 mA
    H-C Voltage150 V

    Audio Performance

    Typical THD5%
    Key Features
    • Low noise
    • Low hum
    • Low microphony
    • High input impedance