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Old 01-21-2018, 10:20 AM
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Motorola Works-in-drawer CRT dimensions

I'd like to know what the actual height and width (not just the diagonal) of the bezel opening or CRT face was in the Motorola solid-state works in a drawer sets.

Does someone have a set they can measure, or can someone give the CRT type number or a link to a spec sheet?
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Old 01-21-2018, 10:54 PM
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OOPS - This should have been in solid-state CRT TV's - can a mod move it please?
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Old 01-22-2018, 08:06 PM
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Quote:
Originally Posted by old_tv_nut View Post
OOPS - This should have been in solid-state CRT TV's - can a mod move it please?
All the WID sets using the TS915 all solid state chassis seemed to use a 23V type CRT, as the 25V's weren't out yet.
The 68 to 70 model years used a 25Xp22 or a 21AP22A, Generally an RCA or Sylvania sourced CRT. The WID sets were TOTL models using the better cabinets and were higher priced than the rest of the Motorola line that used the cheaper Admiral or NVC CRT's.
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Old 01-22-2018, 09:05 PM
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Moved to SS as requested.
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Old 01-22-2018, 10:33 PM
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Originally Posted by dieseljeep View Post
All the WID sets using the TS915 all solid state chassis seemed to use a 23V type CRT, as the 25V's weren't out yet.
The 68 to 70 model years used a 25Xp22 or a 21AP22A, Generally an RCA or Sylvania sourced CRT. The WID sets were TOTL models using the better cabinets and were higher priced than the rest of the Motorola line that used the cheaper Admiral or NVC CRT's.
That's a start. I'm trying to find actual dimensions to see if the aspect ratio was exactly 4x3 or something close.
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Old 01-22-2018, 11:08 PM
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This is for the visible part of the picture tube, inside the bezel. Ratio is 1.28:1, versus 4:3 being 1.33:1.

It's possible my bezel is a bit distorted, it's 50 years old after all!
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Last edited by maxhifi; 01-22-2018 at 11:11 PM.
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Old 01-23-2018, 10:28 AM
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Thanks. I had a vague memory that color CRTs might have been made a bit narrow to allow longer horizontal retrace time (thus cropping off some of the picture) without distorting the aspect ratio of the picture content. Why longer retrace? To reduce peak pulse voltages in the horizontal output device. I do know that the Motorola solid state sets used extra-long horizontal retrace times for this reason, but have (or had) no sure evidence that the CRTs were made narrower to compensate.

If your numbers are accurate, this is a 4% reduction in trace time; this would allow retrace to increase by about 2 microseconds (20%), which would be significant.

A physical spec sheet for the CRT would settle this.
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Old 01-23-2018, 03:03 PM
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Mine has a 25AP22A

Here's the data sheet, scroll down for dimensions.

Aspect ratio though, is 19.844/15.562 = 1.28, which is consistent with my set, and also with your ideas about TVs being slightly narrower than 4x3. Also, if you think about it from test patterns and such, it does always seem like more is cut off on the sides than on the top and bottom. This is a typical CRT size, the 25XP22A in my RCA CTC38 has the same dimensions, and that's a tube TV. Makes me wonder about other brands.

https://frank.pocnet.net/sheets/202/2/25AP22.pdf
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Old 01-23-2018, 03:41 PM
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Thanks!

The bulbs would have been made by one of the large glass companies, and therefore may have had identical aspect ratios for several brands/type numbers of CRTs.
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Old 01-23-2018, 03:50 PM
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I should add, that it looks like the bezel is warped in the photo I took of my TV, but in reality it is perfectly straight - what you're seeing is geometric distortion from my cheap Sony Xperia phone camera lens.

I suppose that the conclusion here, is that old TVs are even less suitable for modern 16x9 programs than we hoped!
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Old 01-23-2018, 05:23 PM
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Quote:
Originally Posted by maxhifi View Post
I should add, that it looks like the bezel is warped in the photo I took of my TV, but in reality it is perfectly straight - what you're seeing is geometric distortion from my cheap Sony Xperia phone camera lens.
You'd probably get the same thing with anything less than a DSLR. Getting straight lines to look reasonably straight in many photos is VERY difficult even with my 4-year-old Canon PowerShot 340HS.
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