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Blorton
Joined: 27 Jan 2009
Posts: 105
Location: Hotlanta, GA
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| Posted: Sat Feb 07, 2009 11:32 pm Post subject: (1272 G2 adjustment) Holy Cow!!!! thanks guys! (and Curt) |
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I decided to check G2 today on our 1272 and was amazed to measure voltages less than 2v on every tube. 
So after a couple of sanity check searches here and beer for courage, I went for it.
I switched to an empty input slot, and reset gain and bias to factory default before adjusting. I was nervous about shorting the terminals, so went very slow. All three guns are now at 4.0x and the IQ makes me giggle like a schoolgirl.
The factory sticker was still in place on those trim knobs, fwiw, and there's a lot of wear on the blue and green tubes. Widescreen movies are within the burned area, so it's not noticeable most of the time.
I'm just amazed, and truthfully, there's plenty of room yet in the focus/calibration on this pj. Incredible...
Thanks guys!
Dan and Laurie
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Sun Feb 08, 2009 1:32 am Post subject: |
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I just got confirmation. If your set has 07msp tubes then your G2 should be 1.5 volts. Reset it now before you kill your projector.
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CRT.
HD done right!
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Blorton
Joined: 27 Jan 2009
Posts: 105
Location: Hotlanta, GA
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| Posted: Sun Feb 08, 2009 6:12 pm Post subject: |
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| AnalogRocks wrote: | | I just got confirmation. If your set has 07msp tubes then your G2 should be 1.5 volts. Reset it now before you kill your projector. |
Thanks for the save! I do have those tubes and reset them to 1.5v.
Would be nice to adapt a microservo system for these. Switch to an unused port and press a button to have a circuit microstep each one to nominal voltage.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Sun Feb 08, 2009 7:22 pm Post subject: |
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Do a search on AKB. It's a circuit that automaticaly does something with the G2's I belive.
Guess I should have paid more attention in class 
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HD done right!
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Blorton
Joined: 27 Jan 2009
Posts: 105
Location: Hotlanta, GA
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| Posted: Sun Feb 08, 2009 10:26 pm Post subject: |
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| AnalogRocks wrote: | Do a search on AKB. It's a circuit that automaticaly does something with the G2's I belive.
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Hmm. would that explain why I measured 1.59 on every tube after running some video for awhile and coming back to the unused interface?
/Yoda voice:
Squirelly, these things can be, yes.
Why is the voltage always changing, I am wondering?
/end voice
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Sun Feb 08, 2009 10:42 pm Post subject: |
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I thought there was a way to disable the AKB while doing the G2's but again. I'm not sure. I never did do mine. (<slacker )
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HD done right!
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