Join Date: Mar 2003
Location: Sunny San Diego
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I got a new green tube from Greg Eisemann for my G90 recently and finally made time to install it and do a first pass calibration.
The green tube I had been using was relatively low hour and showed no wear, but what I didn't know before buying the projector was that it was not an LUG tube but rather an LCP. The difference in overall picture quality between the new LUG and old LCP is staggering.
When I got the G90 a couple years ago it took me a while to discover that the green tube was not a LUG or LQF. After a lot of effort trying to get the EM focus dialed in I never was able to get the green to focus as tight as the red - close, but never quite as tight. Once it was revealed that it was an LCP it made sense that it wasn't user error on my part but the larger aperture in the electron gun.
The new P19LUG Boeing tube I got from Greg Eisemann is amazing.
After letting it wear in and getting the mechanical alignment and optical focus set I made a quick pass at the EM focus. Scan lines, super easily, right away even up in the corners. It brought a tear to my eye.
I reset all the registration values and setup the geometry from scratch. Everything fell into place and it was great to see the red and green overlap without the green bleeding out on either side!
The new tube also has the more correct green c-element, and doing the HCFR stuff showed that in the CIE chart right away. Getting the grayscale dialed in actually has me using a lower Gain value for green than I had before - which I guess might confirm some of the observations people have made about these tubes being a little brighter. I was expecting to have to bump the green gain up or drop the R/B to compensate for the new c-element but that wasn't the case.
Another thing that was obvious right away doing the color calibration was how smooth the new green was compared to the variation in phosphor grain the old one had. From a distance white fields looked white with the old one, but when you got right up to the screen you could see how much small variation there was in the green phosphor grain. The new one is super consistent and smooth, even when you get right up to the screen.
After doing this first pass setup we had some friends over and watched Slumdog Millionaire on Blu-Ray. I've seen the movie before, as had my wife but it was new to our guests. Before we watched the movie my wife had teased me a little bit about having put a lot of time and money into replacing a green tube that looked perfectly fine and our friends who had been over to see lots of movies also said they never thought there could be that much of an improvement over the way it had looked before. When it was over, they had different things to say It looks so much clearer now!
Huge thanks to Greg Eiseman!
The projector has always looked very good, and I was hoping the new tube would be an improvement - but my expectations have been significantly exceeded.
I'm a very satisfied customer and would encourage anyone thinking of getting a tube to talk to Greg.