Preamps
274B
The glass-enclosed eight-pin direct-heated full-wave rectifier is similar to 5U4G and 5Z3P and can be interchanged.
Filament Heating
Voltage......5V
If...2.5A
Limit ratings
Peak anode reverse voltage......1550V
Peak anode current......750mA
Recommended working status
Anode power supply voltage 2×500V
Impedance per arm 75
Load impedance 2000
Filter capacitor 4F
Rectification current 230mA