1st letter |
heater |
1 |
1.4 V parallel or serial |
6 |
6.3V parallel or serial |
10 |
0.1 A serial |
20 |
0.2 A serial |
30 |
0.3 A serial |
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|
next letter(s) |
construction |
C |
frequency changer with oscillator section |
D |
signal diode(s) |
F |
tetrode or pentode |
FD |
tetrode or pentode with diode(s) |
FL |
tetrode or pentode with triode |
K |
gas-filled triode or tetrode |
L |
triode or duotriode with oscillator triode |
LD |
triode with diode(s) |
M |
tuning indicator |
P |
power amplifier tetrode or pentode |
PL |
power amplifier tetrode or pentode with triode |
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|
next number |
serial number |