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Old Philips code e.g. E443

1st letter - heater curent A 0.06 to 0.10A
B 0.10 to 0.20A
C 0.20 to 0.40A
D 0.40 to 0.70A
E 0.70 to 1.25A
F > 1.25A
1st or 1st+2nd digit(s) - heater voltage (1=1.5V, 7=7.5V)
last two digits indicate device type 41, 51 etc. Tetrode with space charge grid (G2 is control grid)
42, 52 etc. Tetrode with screen grid (G1 is control grid)
43, 53 etc. Power pentode
44, 54 etc. Triode or tetrode plus diode
45, 55 etc. HF tetrode with variable gain
46, 56 etc. HF pentode
47, 57 etc. HF pentode with variable gain
48, 58 etc. Hexode frequency changer
49, 59 etc. Hexode with variable gain
Suffix letter if present N New version
S Special enhanced type

This file was last modified 11:44:35, Thursday April 14, 2022