How to read CRT
tube part numbers
All picture tubes, whether monochrome or
color type are identified by a specific code consisting of numbers and letters. The codes are different from
each other because different tubes have different characteristics.
For example, a certain monitor colour
picture tube may have the designation, M34AFA63X03 that can breakdown into 6 parts: M/34/AFA/63/X/03
Computer monitor tubes start with the letter
M while for a TV picture tube, it start with A .
Part 2: Screen diagonal measure in
The 34 means the diagonal viewing measure is
a minimum of 34cm which refers to 14 tube, 36cm is 15 , 41cm is 17 and so on.
Part 3: Family
The three letters AFA designate a family of
tubes that have similar physical and electrical characteristic. These letters are assigned alphabetically
beginning with AAA , followed by AAB, AAC etc.
Part 4: Family
The number 63 shows a specific tube within
the family code. A different number is assigned to tubes within the same family that have different neck
diameters, for example a single digit would be a monochrome tube, but this two-digit number shows it is
Part 5: Phosphor
The fifth symbol gives the phosphor
designation. The letter X here corresponds to P22 for colour picture tubes. Colour monitor tubes can have any
other single letter (excluding I, O, or W) to designate other phosphor type for various applications. For
monochrome pictures, the phosphor symbol is WW, corresponding to P4. Monochrome monitor tubes also can use WW or
some other two-letter combination (excluding I and O).
Part 6: Integral neck
The sixth symbol is assigned only for tubes
having integral neck components, such as the deflection yoke. The specs are only apply to a particular tube
manufacturer. The primary consideration here is winding inductance. The yoke coils have different sensitivity
i.e. deflection per Amp in both horizontal and vertical.
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Author By : Jestine Yong