European Designation (with American Equivalents)
Most post-war European thermionic valve (vacuum tube) manufacturers (such as Telefunken) have used the Mullard-Philips tube designation naming scheme where each part of the name conveys useful information about the device's heater voltage, construction, and base. The KTnn (Kinkless Tetrodes) series are not part this naming scheme.
- First letter: heater/filament type:
A: 4 V heater.
B: 180 mA heater.
C: 200 mA heater.
D: 1.4 V filament/heater.
E: 6.3 V heater.
F: 12.6 V heater.
G: 5.0 V heater.
H: 150 mA heater.
K: 2.0 V filament.
L: 450 mA heater.
P: 300 mA heater.
U: 100 mA heater.
V: 50 mA heater.
X: 600 mA heater.
Z: cold cathode.
- Second and subsequent letters: diode/triode/etc...
A: signal diode.
B: dual signal diodes.
C: triode.
D: power output triode.
E: small signal tetrode.
F: small signal pentode.
H: mixer hexode, special purpose heptode.
K: mixer heptode or octode.
L: power output, beam power or pentode.
M: fluorescent tuning indicator.
N: gas-filled thyratron.
Q: nonode.
Y: power rectifier diode.
Z: dual common cathode rectifier diodes.
E.g. ECCnn is a 6.3 V dual triode; EABCnn has a single detector diode, a common-cathode pair of diodes, and a triode.
- following digits: model number and base type...
e.g. 30-39 implies an octal base, 80-89 or 180-189 implies a noval base.
Read more about this topic: List Of Vacuum Tubes
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