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

Other (3,257 tube types), Pre (2,314 tube types), Power (1,030 tube types), Rectifier (740 tube types)
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Tube-number record

27MP4

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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

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical Operation16000 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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