Tube-number record
A61-120W/R
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BrandMullard
ClassTelevision Picture Tube
BaseSpecial / none
Filament6.3 V @ 300 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass with reinforced metal band
SectionsSingle gun
Filament / Heater
Heater NotesSuitable for series or parallel operation. Surge heater voltage must not exceed 9.5V r.m.s.
Absolute Maximum Ratings
Plate Voltage20000 V
Grid 2 Voltage700 V
Grid 1 Voltage-150 V
H-C Voltage250 V
Audio Performance
Key Features
- Direct viewing
- Metal backed screen
- Reinforced envelope
- No safety screen required
- Electrostatic focusing
- Ring trap base
- Flashover protection spark gaps
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid modulation, Va1 = 400V | 20000 V | — | — | — | 0.25 mA |
| Grid modulation, Va1 = 500V | 20000 V | — | — | — | 0.25 mA |
Application Notes
X-ray shielding is advisable when operated above 20kV. External conductive coating (M) should be connected directly to pin 5 and not to chassis.
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