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_in_peace_
Joined: 21 Jul 2009
Posts: 152
Location: Sweden
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| Posted: Fri Nov 15, 2013 3:49 pm Post subject: Bias question |
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Hi!
I am using a Sony G70 and I wonder what the difference is between increasing the brightness and increasing the three bias values? Will it be the same result on the gamma?
and is there a recommended value for bias like on the gain? (start out with blue gain on max)
Thank's!
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Fri Nov 15, 2013 7:14 pm Post subject: |
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Hello
G2 bias is 400 to 600 volts dc to propel electrons out of the gun, and briteness is a dc level within the video amps driving the guns. Gamma is a low end boost, usually applied to blue, to correct the non-linear response of the blue phosphor. I am sure someone more of an engineer will step in and declare me an idiot 
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thewolfman
Joined: 28 Mar 2011
Posts: 1311
Location: Sweden
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| Posted: Fri Nov 15, 2013 7:41 pm Post subject: Re: Bias question |
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| _in_peace_ wrote: | Hi!
I am using a Sony G70 and I wonder what the difference is between increasing the brightness and increasing the three bias values? Will it be the same result on the gamma?
and is there a recommended value for bias like on the gain? (start out with blue gain on max)
Thank's! |
Schysta bilder!
Till sist: Trist att matchen blev en förlust, var säker på att vi skulle klara noll-noll. Men icke.
Last edited by thewolfman on Sat Nov 16, 2013 8:23 pm; edited 1 time in total
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Fri Nov 15, 2013 9:12 pm Post subject: Re: Bias question |
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| thewolfman wrote: | | Schysta bilder! |
= make photos?
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winny
Joined: 09 Oct 2013
Posts: 403
Location: Sweden
TV/Projector: BD808s, BG1209/2
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thewolfman
Joined: 28 Mar 2011
Posts: 1311
Location: Sweden
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_in_peace_
Joined: 21 Jul 2009
Posts: 152
Location: Sweden
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| Posted: Fri Nov 15, 2013 11:21 pm Post subject: |
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Micke lätt språk faktis!  (very easy language in fact)
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_in_peace_
Joined: 21 Jul 2009
Posts: 152
Location: Sweden
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| Posted: Sat Nov 16, 2013 6:28 pm Post subject: |
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Wolfman how is your G70 going? Any scoop setup yet?
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thewolfman
Joined: 28 Mar 2011
Posts: 1311
Location: Sweden
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| Posted: Sat Nov 16, 2013 8:21 pm Post subject: |
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| _in_peace_ wrote: | | Wolfman how is your G70 going? Any scoop setup yet? |
Oh, I have a scoop set up to but currently not running due to a little part needed to be changed to keep the voltage from drifting and ruining the tubes prematurely. I should have that part within the next 2 weeks. But is a marquee though.
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_in_peace_
Joined: 21 Jul 2009
Posts: 152
Location: Sweden
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| Posted: Sun Nov 17, 2013 9:50 pm Post subject: |
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I have problem with the lowest end of the 16-235. When lifting it the image get a foggy look but the lowest dark gray scale is visible. So its a bit of a compromise what to do. 16-235 and foggy image or 26-235 and a super clear image with real depth in it.
Is this a standard phenomenon on CRT projectors?
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Tue Nov 19, 2013 12:28 am Post subject: Re: Bias question |
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| _in_peace_ wrote: | | what the difference is between increasing the brightness and increasing the three bias values? Will it be the same result on the gamma? |
Same but different, brightness is global to the image BIAS is specific to that color. If you want decent gamma without a VP keep the contrast <70.
| _in_peace_ wrote: |
and is there a recommended value for bias like on the gain? (start out with blue gain on max) |
You can start at the factory recommend however Bias and Gain are unique to every machine. If I recall right my blue is also less than 255.
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