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Bias question

 
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_in_peace_



Joined: 21 Jul 2009
Posts: 148
Location: Sweden


PostLink    Posted: Fri Nov 15, 2013 3:49 pm    Post subject: Bias question Reply with quote


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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: 4263
Location: Phoenix


PostLink    Posted: Fri Nov 15, 2013 7:14 pm    Post subject: Reply with quote

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 Smile
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thewolfman



Joined: 28 Mar 2011
Posts: 1307
Location: Sweden


PostLink    Posted: Fri Nov 15, 2013 7:41 pm    Post subject: Re: Bias question Reply with quote

_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: 1253
Location: Germany

TV/Projector: Marquee 9500 Ultra


PostLink    Posted: Fri Nov 15, 2013 9:12 pm    Post subject: Re: Bias question Reply with quote

thewolfman wrote:
Schysta bilder!

= make photos?
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winny



Joined: 09 Oct 2013
Posts: 401
Location: Sweden

TV/Projector: BD808s, BG1209/2


PostLink    Posted: Fri Nov 15, 2013 9:17 pm    Post subject: Re: Bias question Reply with quote

barclay66 wrote:
thewolfman wrote:
Schysta bilder!

= make photos?


=nice photos

Oh, and if you need a crash course in Swedish, there is always mastering Swedish. Freakin' hilarious!

[url]
http://www.google.se/url?sa=t&source=web&cd=2&ved=0CCwQtwIwAQ&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D66fULfwb2X4&ei=jI-GUr_fNMuZ4gSVqYGQBg&usg=AFQjCNE85PrjKPcqAltx84eepnpl-uXO3A
[/url]


Last edited by winny on Fri Nov 15, 2013 9:23 pm; edited 2 times in total
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thewolfman



Joined: 28 Mar 2011
Posts: 1307
Location: Sweden


PostLink    Posted: Fri Nov 15, 2013 9:20 pm    Post subject: Reply with quote

http://www.curtpalme.com/forum/viewtopic.php?t=5318&start=940

I meant the photo of the last Swede made Smile
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_in_peace_



Joined: 21 Jul 2009
Posts: 148
Location: Sweden


PostLink    Posted: Fri Nov 15, 2013 11:21 pm    Post subject: Reply with quote

Micke lätt språk faktis! Very Happy (very easy language in fact)
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_in_peace_



Joined: 21 Jul 2009
Posts: 148
Location: Sweden


PostLink    Posted: Sat Nov 16, 2013 6:28 pm    Post subject: Reply with quote

Wolfman how is your G70 going? Any scoop setup yet?
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thewolfman



Joined: 28 Mar 2011
Posts: 1307
Location: Sweden


PostLink    Posted: Sat Nov 16, 2013 8:21 pm    Post subject: Reply with quote

_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: 148
Location: Sweden


PostLink    Posted: Sun Nov 17, 2013 9:50 pm    Post subject: Reply with quote

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: 929
Location: S.E. Michigan VPH-G70Q


PostLink    Posted: Tue Nov 19, 2013 12:28 am    Post subject: Re: Bias question Reply with quote

_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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