How to Read CRT Tube Part Numbers


Visitors: 690

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

Part 1: Application

Computer monitor tubes start with the letter “M" while for a TV picture tube, it start with “A".

Part 2: Screen diagonal measure in centimeters (cm)

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 code

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 number

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 colour.

Part 5: Phosphor Type

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 components

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.

Jestine Yong is a electronic repairer and writer. For more information about electronic repair please visit his website at


Article Source:

Rate this Article: 
Things To Know Before You Buy Your Next CRT TV
Rated 4 / 5
based on 5 votes

Related Articles:

Reverse Look Up Phone Numbers Read This Before You Reverse Look Up Phone Numbers

by: Roger Phillips (July 04, 2008) 
(Communications/Mobile Cell Phone)

Tube Fittings and Pipe Fittings Double Ferrule Tube Fittings

by: Tom Andrew (July 02, 2008) 
(Business/Industrial Mechanical)

Numbers, Nature, and Philosophy (Part 2)

by: Dharmbir Sharma (May 08, 2006) 
(Arts and Entertainment/Philosophy)

Numbers, Nature, and Philosophy (Part 1)

by: Dharmbir Sharma (May 08, 2006) 
(Arts and Entertainment/Philosophy)

Real Estate Investing By The Numbers: Part 1

by: Chris Anderson (November 15, 2006) 
(Real Estate)

Numbers Lie Statistics, Politics and the Media, Part 2

by: Randy Bisenz (July 25, 2008) 
(News/Pure Opinion)

Numbers Lie Statistics, Politics and the Media Part 1

by: Randy Bisenz (July 25, 2008) 
(News/Pure Opinion)


by: Jacob Bodnar (August 24, 2005) 
(Computers and Technology/Hardware)

CRT Technology

by: Julia Hall (July 25, 2007) 
(Computers and Technology)

Things To Know Before You Buy Your Next CRT TV

by: Staggerlee Phillips (July 01, 2007) 
(Arts and Entertainment)