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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Sun Apr 06, 2008 9:01 pm Post subject: CRT part numbering explained, courtesy of Sencore |
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While this does not explicitly list our P prefixed tubes, it's easy to imagine that the P is for "projection."
http://www.sencore.com/custsup/pdf/TT145.pdf
The CRT theory is not all that interesting, and describes a direct-view tube, but page 2 and three contains "Understanding CRT numbers"
Excerpted:
WTDS Standard
Since April 1, 1982, a new system for
categorizing and numbering CRTs has
been in use. This system is officially called
Worldwide Type Designation System
(WTDS) for TV picture tubes and monitor
tubes. Until the adoption of this system,
American, Japanese, and European tube
manufacturers had all numbered their
tubes differently. This has led to confusion
and incomplete or inaccurate information in
the past. The new WTDS numbering is an
effort to simplify and unify CRT designations.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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front_range
Joined: 03 Mar 2008
Posts: 64
Location: North of Colorado Springs
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| Posted: Sun Apr 06, 2008 10:54 pm Post subject: |
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So if I read that correctly, P16 refers to a diagonal size of a tad bit over 6", but P16 tubes come in some sets that are rated as 7" CRT sets as well as some that are rated as 8" sets??
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Sun Apr 06, 2008 11:12 pm Post subject: |
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P16 refers to 160mm diagonal.
The world is metric.
7"/8"/9" are just some archaic descriptions from the 16th century, and bear no resemblance to reality.
Even Liberia and Burma are now metric.
Catch up 
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sun Apr 06, 2008 11:29 pm Post subject: |
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Ya but, whip out my big 200mm just doesn't cut it for me. 
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Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Sun Apr 06, 2008 11:37 pm Post subject: |
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I'm a mechanical engineer by training, and can think transparently in base-10 metric as easily as base-thumb English 
Yeah, P16 means 16cm, 160mm, and the actual conversion is 6.3" (approximately.)
This standard has been alluded to here and at AVS, but I've never read it formally laid down as this Sencore document states.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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front_range
Joined: 03 Mar 2008
Posts: 64
Location: North of Colorado Springs
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| Posted: Mon Apr 07, 2008 12:00 am Post subject: |
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My point is that it's rather arbitrary to refer to some sets as 7" vs others as 8" when the phosphor area is the same by the CRT vendor's spec.
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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MikeEby
Joined: 24 Jun 2007
Posts: 5237
Location: Osceola, Indiana
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| Posted: Mon Apr 07, 2008 1:17 am Post subject: |
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| Mark_A_W wrote: | P16 refers to 160mm diagonal.
The world is metric.
7"/8"/9" are just some archaic descriptions from the 16th century, and bear no resemblance to reality.
Even Liberia and Burma are now metric.
Catch up |
ROFL
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Doing HD since the last century!
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Mon Apr 07, 2008 2:13 am Post subject: |
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| front_range wrote: | | My point is that it's rather arbitrary to refer to some sets as 7" vs others as 8" when the phosphor area is the same by the CRT vendor's spec. |
It gets even murkier when NEC describe a PG Xtra as a 7"er, and Sony describe a G70 as an 8"er....when the green tube is IDENTICAL (and the red and blue are the same face size).
The size in inches is a pure marketing number.
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Mon Apr 07, 2008 11:44 am Post subject: |
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| front_range wrote: | | My point is that it's rather arbitrary to refer to some sets as 7" vs others as 8" when the phosphor area is the same by the CRT vendor's spec. |
Yep. Utterly arbitrary.
O'Course, I'm from a town where we measure the length of bridges in smoots and teach engineering classes in stonesthrow.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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