Neotec nt-500dx issues

yoooooon

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Hey guys, (crossposted at arcadeotaku)

I got a Neotec NT-500dx - it features an LG Philips tube (did a search on the model number and nothing came up in google), Tri-sync chassis, and a bonded yoke. 27 inch tube.

In 31khz, the picture looks great!!!

But in 15khz, the picture looks all crazy. Three main issues keeping it from looking amazing. 1. for some reason, the red color is WAY over pronounced, and 2. any major change in brightness causes the screen to resize about a few millimeters (like the intro where it flashes white and black in super turbo makes the screen go crazy!), and 3. When I increase the vertical hold, at max 100% it just barely doesn't fit the front of the screen.

I've spent time adjusting all the pots -- an HV hold pot, flyback pots, etc but with no luck. I'm under the assumption that this is just how the tube looks stock with 15khz games and it's really designed for 31khz. I've also got it hooked up via the CGA/EGA header with the sync wire going to comp as well, and have tried all jumper combinations as well. Interestingly enough, when I hook my Naomi up through vga and send a 15khz signal, the image resizing and redness go away and the image looks decent, but the scanlines are mega thick.

If you guys have any ideas, I'm all ears!

Also, I've done a reading on the yoke, which reads about: (Although it might read a little high because my multimeter sucks.)

.210 mh
4.5 mh

If you know of an appropriate chassis I can test out, please let me know. I appreciate all of your help everyone!
 
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