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
Famous quotes containing the words european, designation and/or american:
“Long accustomed to the use of European manufactures, [the Cherokee Indians] are as incapable of returning to their habits of skins and furs as we are, and find their wants the less tolerable as they are occasioned by a war [the American Revolution] the event of which is scarcely interesting to them.”
—Thomas Jefferson (1743–1826)
“In a period of a people’s life that bears the designation “transitional,” the task of a thinking individual, of a sincere citizen of his country, is to go forward, despite the dirt and difficulty of the path, to go forward without losing from view even for a moment those fundamental ideals on which the entire existence of the society to which he belongs is built.”
—Ivan Sergeevich Turgenev (1818–1883)
“Other centuries had their driving forces. What will ours have been when men look far back to it one day? Maybe it won’t be the American Century, after all. Or the Russian Century or the Atomic Century. Wouldn’t it be wonderful, Phil, if it turned out to be everybody’s century, when people all over the world—free people—found a way to live together? I’d like to be around to see some of that, even the beginning.”
—Moss Hart (1904–1961)