Z729/EF86
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BrandM-O Valve Co. Ltd.
ClassAF Pentode
BaseB9A
Filament6.3V @ 0.2mA
Construction
Primary TypePentode
EnvelopeTubular Glass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage300 V
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
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 250V | 1850 | 2000000 | 38 | 3mA |
| Triode | 250V | 2000 | 16500 | 33 | 4mA |
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.
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