Tube-number record
5R4-G
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BrandSheldon
ClassFull-Wave High-Vacuum Rectifier
BaseOctal
Construction
Primary TypeRectifier
Rectifier TypeHigh-Vacuum
EnvelopeST16
Base MaterialMedium Shell Octal
Sections2
Filament / Heater
MaterialCoated
Warm-up Time10s
Absolute Maximum Ratings
Plate Voltage2800 V
Cathode Current650 mA
Audio Performance
Key Features
- Coated Filament
- Full-Wave
- High-Vacuum
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Condenser Input Filter (700V RMS) | 700 V | — | 125 | — | 250 mA |
| Condenser Input Filter (900V RMS) | 900 V | — | 575 | — | 150 mA |
| Choke Input Filter (750V RMS) | 750 V | — | — | — |
Application Notes
Horizontal operation is permissible if pins 1 and 4 are in a vertical plane. For capacitor inputs larger than 4 mfd, additional plate-supply impedance may be required. Filament should reach operating temperature (approx 10s) before plate voltage is applied.
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