Thanks, Mauzy. Looks like I do have a G07. The one you have circled corresponds with mine that is labeled V. Hold. The other ones are labeled V. Lin, V. Height, and H. Freq.
And H. Cent doesn't have a control attached to it. Now that I swapped the 4D chip out to 1N, the vertical hold seems to be ok. I assume you just turn them with a screwdriver to adjust.
Any recommendations on where else to get a 07xx chip?
Yes sir you have a G07(or something incredibly close). A screwdriver should be fine. Theres also a little bitty tab on the top you could hit with your thumbnail, but with it mounted vertically I don't know if this would work.
H.Cent is actually changed with a jumper on one of three metal tabs on the board. Honestly, I've never had this control work when I changed the jumper.
BTW, and I'm sure you figured this out but In searching for a 07xx chip, I found the definitions for all the chips. 07xx is indeed a sync generator.
Sadly, the site I always use (mikesarcade.com) is out of the 07xx chip. Turns out they're $30 too! You might want to go to his site and contact him. I know he posts here too, but I'mnot sure of his screen name. I'm sure if you search hard enough you'll find one somewhere. Oh you already said that.
I can't find anywhere but therealbobroberts.net . I've ordered from them before and they're great! Their only drawback is you can only pay through money order so you have to wait for them to receive that, then they ship. On the plus side his 07xx is only $20. I usually only order from them when I have a big list because he has awesome prices, might as well only wait once for everything. Be sure to read his shipping, payment, and ordering faqs if you want to order from him.