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

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A56-120X vacuum tube outline illustration

Tube-number record

A56-120X

0 archive entries

A56-120X is a tube type in the TubeDatabase archive (class: Colour Television Picture Tube). Recorded specifications: construction Display / CRT, socket CRT base (B12 family), and maximum plate voltage 27500 V. The archive does not yet hold a photographed example of this type.

ClassColour Television Picture Tube
BaseCRT base (B12 family)
Filament6.3 V @ 900 mA

Construction

Primary TypeDisplay / CRT
EnvelopeReinforced glass
SectionsTriple-gun

Filament / Heater

Heater NotesRegulated supply recommended for maximum cathode life.

Absolute Maximum Ratings

Plate Voltage27500 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Standard25000 V———0.8 mA

Application Notes

Magnetic shielding must be provided to minimize extraneous magnetic fields; shielding should be 0.5mm minimum thickness cold-rolled mild steel.

Datasheets

Datasheet: A56-120X.pdf

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

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    Grid 2 Voltage400 V
    Cathode Current1 mA
    H-C Voltage250 V

    Audio Performance

    Key Features
    • Advanced red phosphor, europium activated
    • Unity current ratio
    • Temperature compensated shadow-mask
    • Reinforced tube envelope - separate safety screen not required