Looking for something that does multi-point gamma correction without analog to digital conversion.

I'm looking for something that has similar capabilities to the Lumagen Radiance with regard to gamma correction, but I need something that is analog in and analog out, with no digital conversion in between.

Were there any such devices produced in the past? I imagine there could have been demand for something like that in the 90's, and it would probably resemble a graphic equalizer electronically.

Both of those Lumagens have this on their specs page:

I don't think that can be bypassed. I'm sure that even analog signals are converted to digital internally for modification before they are converted back to analog for the display.

I'll be using this for all the game consoles released between 1999 and 2002, and the Wii. Those were all 480p, and 480p material is darker on my display than higher-res material. Keeping the entire signal path analog ensures there won't be any signal delay due to digital conversion.
Edited by CRTFTW - 1/21/13 at 2:28pm

Did you use them for video games though? It's impossible to notice 3/60ths of a second delay when you're watching a movie, but when you're playing a fighting game or racing game it's painfully obvious.

And I'm sure if there any pure analog models out there, they're probably pretty cheap on the secondhand market.

HD Fury converts HDMI to RGBHV, so that doesn't help me here. GammaX just deals with deep black, I need gamma correction for the whole spectrum. Actually my main issue is that I need to adjust the upper middle whites, I need to make them darker.

I've noticed delay on Sony HD CRT I used to use. Those TV's actually digitally process analog signals before they convert them back to analog for the electron guns. In 480p mode, even though there is no scaling, there was noticeable delay caused by the color processing, especially in wide mode. So that experience has made me wary of using any digital processing with my analog stuff.

I'm hoping there is some HT stuff from the 90's that just used a series of sliders and potentiometers that someone here knows about. Honestly I don't even know which words I should search for on Google and Ebay. Gamma Adjuster? Gamma Equalizer? Grayscale calibrator? All those terms are bringing up mostly computer software.

Yeah, you're definitely an authority on this sort of the thing because of your unique setup. Looks like I might have to study the service manual for my monitor and see if there's anything in there I can tinker with.

As far as calibration, my plan was to throw test patterns on my other monitor, a Sony PVM formerly used for endoscopy, as a reference. I'm still looking into other options too, like line doubling, which would have the effect of making my picture much brighter at 480p.