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Where's the gamma?

 
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johnty




Joined: 12 Feb 2008
Posts: 4



PostLink    Posted: Tue Feb 12, 2008 5:11 am    Post subject: Where's the gamma? Reply with quote


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I just hooked up my RTC2200 and tried playing with the black level control, which did nothing.
The downloaded user's guide said that if your monitor is AC coupled, then nothing will happen.

Nothing happened.

I've got an Ampro 4600. I've tried changing from Back Porch Clamp to Sync-Tip Clamp but it
doesn't make any difference.

Is the gamma control labeled BLKLVL? Will it work on an Ampro. Am I not adjusting the right
control?

Thanks,
John
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kal
Forum Administrator



Joined: 06 Mar 2006
Posts: 16767
Location: Ottawa, Canada

TV/Projector: JVC DLA-RS56


PostLink    Posted: Tue Feb 12, 2008 5:02 pm    Post subject: Reply with quote

The gamma control is indeed the BLKLVL pot. (Note to Kim: Maybe re-label it as "GAMMA" in future boxes?)

It's a multi-turn pot, 25 turns IIRC. You have to turn it 10-15 times before anything happens. I can't remember which way is which but I think the manual explains it. I turned mine all the way down by turning it 25 times or so, and then going up around 11 turns gave the best results for me.

Kal

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beun




Joined: 28 Jun 2006
Posts: 676



PostLink    Posted: Tue Feb 12, 2008 5:35 pm    Post subject: Reply with quote

John,

Are you sure that you have the RTC2200, only the RTC2000 (the one without gamma) mentions that thing about the AC-coupling.

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ESL-0.5 Full Range Electrostatic Loudspeakers | RTC2200 Component to VGA Converter with Gamma Boost
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johnty




Joined: 12 Feb 2008
Posts: 4



PostLink    Posted: Wed Feb 20, 2008 1:20 am    Post subject: Reply with quote

Beun, You were correct. I don't know how I brought up a copy of the RTC2000 but it does mention AC-coupling and nothing on gamma.

Kal, At first the BLKLVL pot would only make a quarter turn. But after your information, I just applied more pressure and it started to rotate for many turns. Mid-point, as you said, seems to be about right. Raising the gamma makes the Ampro sing! Lowered the black level for
true CRT blacks but with black-level detail that increased gamma gives.

The final tweak!
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kal
Forum Administrator



Joined: 06 Mar 2006
Posts: 16767
Location: Ottawa, Canada

TV/Projector: JVC DLA-RS56


PostLink    Posted: Wed Feb 20, 2008 1:51 am    Post subject: Reply with quote

johnty wrote:
Kal, At first the BLKLVL pot would only make a quarter turn. But after your information, I just applied more pressure and it started to rotate for many turns. Mid-point, as you said, seems to be about right. Raising the gamma makes the Ampro sing! Lowered the black level for
true CRT blacks but with black-level detail that increased gamma gives.

The final tweak!

It's nice isn't it? Once you've lived with it for while, turn it off again. You'll wonder how you ever lived without it! Smile

Kal

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tri_joel




Joined: 03 Jul 2007
Posts: 646
Location: Northern Virginia


PostLink    Posted: Sat Jun 07, 2008 6:19 pm    Post subject: Reply with quote

The black level pot on my 2200 turns and turns and turns I counted up to 40 turns before I got nervous and stopped. It does not click and I don't see any change in the picture.
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beun




Joined: 28 Jun 2006
Posts: 676



PostLink    Posted: Sun Jun 08, 2008 3:52 am    Post subject: Reply with quote

The click is very subtle and you will only really see something if your blacklevel is setup right.
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ESL-0.5 Full Range Electrostatic Loudspeakers | RTC2200 Component to VGA Converter with Gamma Boost
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