AVS Forum banner
Status
Not open for further replies.
1 - 7 of 7 Posts

·
Registered
Joined
·
23 Posts
Discussion Starter · #1 ·
Hi,

I'm looking at picking up a Seleco SVT150 CRT with low

hours on the tubes. It's a 110 ANSI lumen unit and I'm

wondering how big a screen size I could expect (with suitable

brightness) when projecting on to a white wall and/or

screen. The room will be almost completely dark when the

unit will be in use. I've seen several formulas for screen

brightness, however I've also seen an 8" CRT project a

quite bright, much bigger picture than the formulas would

suggest. Just a bit confused.


Mike.
 

·
Registered
Joined
·
2,016 Posts
Hi,


That unit is a video only CRT unit. In the UK it was the projector of choice for pub installations. I would suggest you don't go above 7ft diagonal 4:3.


Gordon
 

·
Registered
Joined
·
23 Posts
Discussion Starter · #3 ·
Thanks. I take it that 7ft diagonal would be with a reasonably

high gain screen? The room I'll be using it in isn't fully light

controlled, so I might go for a smaller screen size for the

brightness.


Mike.
 

·
Registered
Joined
·
380 Posts
You should ,if you can afford get at least a projector than can take linedoubling. It will make a big difference in image quality.


What linedoubling is? Just take a search and you will finds loads of information.
 

·
Registered
Joined
·
430 Posts
Mike,


Andre is right. IMO, the basic requirement for a decent PQ from any CRT projector is that it has a high enough horizontal scan frequency, fh, to do "line doubling" i.e. present a progressive image. This means that fh >= 31 kHz. Interlaced PAL or NTSC looks like sh-t on a front projector with a very clearly visible line structure.
 

·
Registered
Joined
·
23 Posts
Discussion Starter · #6 ·
Hi,

I'm assuming from what has been said that only data

capable projectors have the bandwidth capability for

progressive scan? Would this mean that this projector

could not be fed with a progressive scan signal from a

DVD player. Still looking around at DVD players at the moment

so VHS is what will be fed into it, hence I doubt it will look

great whatever scan method I feed it.


Mike
 

·
Registered
Joined
·
430 Posts
Mike,


Yes, the projector has to be "data capable" to display a progressive signal. Even VHS will look worse than it should when displayed interlaced. However, in order to deinterlace the VHS signal you will need either a scaler or an HTPC with a capture card and dScaler software.
 
1 - 7 of 7 Posts
Status
Not open for further replies.
Top