Tube-number record
27MP4
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27MP4 is a tube type in the TubeDatabase archive (class: Cathode Ray Tube). Recorded specifications: brand TUNG-SOL, year 1954, construction Other / special, socket Duodecal, and maximum plate voltage 18000 V. The archive does not yet hold a photographed example of this type.
BrandTUNG-SOL
ClassCathode Ray Tube
BaseDuodecal
Filament6.3 V @ 0.6 mA
Construction
Primary TypeOther / special
EnvelopeMetal Shell Lip
SectionsSingle
Filament / Heater
Heater NotesUnipotential Cathode
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage500 V
Grid 1 Voltage125 V
H-C Voltage180 V
Audio Performance
Key Features
- Aluminized screen
- Magnetic focus & deflection
- Frosted filterglass faceplate
- External single field ion trap
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | 16000 V | — | — | — | — |
Application Notes
Brilliance and definition decrease with decreasing collector voltage. Collector voltage should not be less than 16,000 volts. Shielding of X-ray radiation may be necessary when anode exceeds 16 KV.
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