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NU18 / U17 rectifier
Size The valve measures 140x50mm overall and has a 4-pin base.

The valve carries the marking Adm. Patt. W284.

Filament voltage 4V
Filament current 1A
Max applied RMS voltage 2.5kV
Max working PIV 6.5kV
Max no load PIV 7kV
Max mean DC output current 30mA
Max peak anode current 200mA
Max reservoir capacitor 1µF
Min external limiting resistance 2k ohm


Pin Function
1 n/c
2 n/c
3 Filament
4 Filament
TC Anode
Top quarter view Bottom quarter view

This file was last modified 15:45:26, Thursday August 28, 2014