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dobbar
Joined: 10 Feb 2008
Posts: 32
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| Posted: Thu Apr 17, 2008 2:45 pm Post subject: SD187 tubes |
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In the crt primer it mentions that the sd187 tubes (the ones used in both my projectors) only have a usable 5.5"
worth of phosphor - Is this because of the frame you can see looking through the lenses, if so, does that mean I can allow the
raster to be a fair bit larger ? (projecting over this frame)
Thanks.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Apr 18, 2008 2:45 pm Post subject: |
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It's a bit of BS that every manufacturer used. Measure any CRT tube, and you'll see that none of them come close to the phosphor area that they claim.
No, don't overshoot the active phosphor surface, you can implode the tube.
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dropzone7
Joined: 12 Jun 2007
Posts: 1069
Location: Charlotte, NC
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| Posted: Fri Apr 18, 2008 3:06 pm Post subject: |
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| Curt Palme wrote: | | It's a bit of BS that every manufacturer used. Measure any CRT tube, and you'll see that none of them come close to the phosphor area that they claim. |
Maybe we can start a class action suit and get some new tubes out of them! False advertising! Just enough to supply all of the 8" and 9" folks around here.
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