European designation system

For example: EABC 80
1st letter heater
0 tube without heater
A 4 V AC parallel
B 180 mA DC
C 200 mA AC/DC serial or parallel
D 0.62, 1.25, 1.4 V parallel
E 6.3 V AC/DC parallel
F 12.6 V DC
G 5V AC parallel
H early: 4V DC later: 150mA AC/DC serial
I 20V AC/DC parallel
K 2 V DC
L 450 mA AC/DC
O 150 mA AC/DC serial
P 300 mA AC/DC serial
T 7.4 V, other
U 100 mA AC/DC serial
V 50mA AC/DC serial
X 600 mA AC/DC serial
Y 450 mA AC/DC serial
next letter(s) construction
A diode
B duodiode
C triode
D power triode
E tetrode
F pentode
H hexode or heptode
K octode
L power tetrode or pentode
M indicator tube
N thyratron
Q nonode
S TV sync. oscillator
T beam tube
W half-wave gas-filled rectifier
X full-wave gas-filled rectifier
Y half-wave rectifier
Z full-wave rectifier


next number(s)

base and serial number
1-10 various side contacts, octals, specials
11-19 8 pin German octal
20-29 loctal B8G, some octal
30-39 international octal
40-49 rimlock B8A
50-59 B9G, loctal B8G, octal, 3 pin glass, disk-seal, German 10 pin with spigot, min. 4-pin, B26A, magnoval B9D
60-69 B9G, some subminiatures
70-79 loctal Lorenz, wire subminiatures
80-89 noval B9A
90-99 B7G
100-109 B7G, Wermacht base, German PTT base
110-119 8 pin German octal, rimlok B8A
130-139 octal
150-159 German 10 pin with spigot, 10 pin glass with one big pin, octal
160-169 Flat wire submins, 8 pin German octal
170-179 RFT 8 pin, RFT 11 pin all glass with one offset pin
180-189 noval B9A
190-199 B7G
200-209 decal B10B
230-239 octal
270-279 RFT 11 pin all glass with 1 offset pin
280-289 noval B9A
300-399 octal
400-499 rimlok B8A
500-529 magnoval B9D, novar
600-699 flat wire-ended
700-799 round wire-ended
800-899 noval B9A
900-999 B7G
1000- round wire-ended, special nuvistor
2000- decal B10B
3000- octal
5000- magnoval B9D
8000- noval B9A