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jeffslife
Joined: 17 Apr 2010
Posts: 4190
Location: ohio usa
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| Posted: Tue Feb 22, 2011 2:27 am Post subject: what does AKB adjustment do? |
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on a zenith 900 pro x ?
I know, I know RTFM.
Its not for me its for a friend and I dont have the manual anymore.
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Last edited by jeffslife on Tue Feb 22, 2011 4:16 am; edited 1 time in total
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue Feb 22, 2011 4:15 am Post subject: |
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As I understand AKB is a system that compensates for tube wear.
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rosenbush
Joined: 14 May 2010
Posts: 94
Location: Brownsville Texas
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| Posted: Tue Feb 22, 2011 5:13 am Post subject: |
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Many CRT-based video display systems employ an automatic kinescope bias (AKB) control systems for maintaining proper black image current levels for each electron gun of an associated image displaying kinescope or CRT. The purpose of such AKB control systems in a CRT is to prevent the displayed picture colors and picture grey scale information from being adversely affected by variations in the kinescope bias due to such factors as aging, temperature changes, etc.
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jeffslife
Joined: 17 Apr 2010
Posts: 4190
Location: ohio usa
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| Posted: Tue Feb 22, 2011 5:18 am Post subject: |
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Wow, thanks !
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue Feb 22, 2011 5:25 am Post subject: |
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| rosenbush wrote: | | Many CRT-based video display systems employ an automatic kinescope bias (AKB) control systems for maintaining proper black image current levels for each electron gun of an associated image displaying kinescope or CRT. The purpose of such AKB control systems in a CRT is to prevent the displayed picture colors and picture grey scale information from being adversely affected by variations in the kinescope bias due to such factors as aging, temperature changes, etc. |
Yeah like I said it compensates for tube wear.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Feb 22, 2011 7:34 am Post subject: |
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Look in your G70 manual, Jeff... Sony calls the same thing "ABG" - Same thing we were talking about in the "flickering G70 thread" a few weeks ago.
SC
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jeffslife
Joined: 17 Apr 2010
Posts: 4190
Location: ohio usa
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| Posted: Tue Feb 22, 2011 10:51 pm Post subject: |
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Thanks steve.
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jeffslife
Joined: 17 Apr 2010
Posts: 4190
Location: ohio usa
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| Posted: Wed Mar 02, 2011 12:31 am Post subject: |
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I turned it off on my g70 and the picture changed dramatically, Is it better to have this on or off when doing a new set up ?
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Wed Mar 02, 2011 12:46 am Post subject: |
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| jeffslife wrote: | | I turned it off on my g70 and the picture changed dramatically, Is it better to have this on or off when doing a new set up ? |
It depends on the firmware you have, if you have the earlier firmware with G2 controls I would probably leave it off. If you don't have G2 controls (like me) it's almost essential to use, especially if you have high hours and dimmer tubes.
AKB/ABG gives you a more consistent gray scale as the tubes wear but unfortunately on the G70 it also gives you lines on the tube-face that cannot be blanked and may show up on the screen depending on source resolution and setup.
We'll figure it out Saturday! 
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