Tube-number record
GU1
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BrandOsram
ClassRectifier
Base4-pin
Construction
Primary TypeMercury Vapour
Rectifier TypeHalf Wave
EnvelopeGlass
SectionsSingle
Filament / Heater
Warm-up Time30s
Absolute Maximum Ratings
Plate Voltage1000 V
Cathode Current250 mA
Audio Performance
Key Features
- Hot Cathode
- Mercury Vapour-filled
- Blue glow due to ionisation
- Low impedance
- Constant voltage drop
Application Notes
On no account must the H.T. voltage be applied at the same time as filament voltage. Filament should be switched on 0.5 to 1 minute before H.T. After transit or disuse, run filament for 15 minutes before applying anode voltage. Series resistance required to limit current if positive voltage > 15V is applied.
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