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:
“No European spring had shown him the same intermixture of delicate grace and passionate depravity that marked the Maryland May.”
—Henry Brooks Adams (1838–1918)
“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)
“There is one expanding horror in American life. It is that our long odyssey toward liberty, democracy and freedom-for-all may be achieved in such a way that utopia remains forever closed, and we live in freedom and hell, debased of style, not individual from one another, void of courage, our fear rationalized away.”
—Norman Mailer (b. 1923)