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Japanese Encoding System - JIS

First digit : aprox. filament voltage

First letter :

D - super miniature

G - octal

L - locktal

M- miniature 7 pin

N - nuvistor

R - miniature 9 pin

X - 4 pin

Y - 5 pin

Z - 6 pin

W - 7 pin

T - large 7 pin

B - other

 

First letter after hyphen :

L - small triode with mu < 30

H - small triode with mu > 30

A - power triode

R - sharp cutoff RF tetrode or pentode

V - remote cutoff RF tetrode or pentode

B - Power beam tetrode

P - power pentode

D - detector diode

K - kenotron

G - gas rectifier

E - magic eye

 

Last digit :

Indicates diffireces in characteristics. For rectifiers - even digit for full wave rectifier,

odd digit for half wave rectifier.