This project can fail spectacularly if he doesn't have the tube in hand.
Yep, went blue in the face about it in November. But apparently he can't legally obtain one from out of country (no used electronics through customs), and supposedly Turkey has no CRT's (which is confusing because there's clearly one in the cab he has already made that's very likely the right size because at least in the US 19" and 20" is a marketing difference, same size tube).
You do know that all Sega cabs have ungrounded monitors? It's not a risk like you think it is.
My understanding (and I'm happy to be corrected, because I'm trying to understand properly and getting two different stories from people who don't want to be wrong), is that the monitors Sega used (largely Nanao and other monitors that don't need an ISO transformer) are fine to be grounded just as they are in candy cabs (minimally). But monitors that require an ISO transformer (like this era WG's) need to be grounded better/differently/I don't know what term to use here. And that the frame serves this purpose in some cases.
Neckboard wires have slack in them which is zipped up. The yoke wires have slack in them. The degauss connection has slack in it. The anode wire has slack in it.
You're talking a foot in extra wire, probably more. None of these lines are likely to have that much slack. Putting the chassis on the wall or bottom of the cab are very likely to not work out without modifying things. But at least you're measuring and in this instance we'll know. But it still introduces the risk of necking the tube when rotating as some people have found out with E2's that they didn't run the wires right on.
K7000 is earth grounded from tube dog ears->dag strap/wire->neckboard->chassis->earth ground (in most cases). I mentioned that earlier.
And several people have said you're incorrect in this. That's conflicting information.We need to be figure out who's right, not just "I'm right, I've seen it a bunch of times.". Because when both sides do that, someone is going to be wrong, and it's probably going to be the one that gets followed because that's just Murphy's Law.
a tray fastned to the tube.
Is this not, almost exactly what a frame is? It's big metal bit, fastened to tube, that holds the chassis. Which is what we've been talking about, and hursit has been talking about redesigning.
But what we do know is the orginal frame won't fit in the cab. You yourself confirmed this.
I have a dozen times said "I don't know if it would fit with the frame". So I'm a little lost as to where I confirmed anything of the sort. I haven't even had a frame to test with. Which was the /entire point/ of you doing so with that local Cute. It was the entire point of rg111 shipping his. I'm not even trying to be rude, but are you reading what I write? Because saying this just screams "I only read part of what you wrote then decided to reply". Because I have honestly said this over a dozen times now that I have not had a frame to test with.
Here's one of those times that you would have read just last night before making your post:
And as I said then, and as I say now, I have no idea how it'd fit with the frame or anything else involved. But if you're just talking tube in the space that the monitor goes in: it fits.
You seem too comfortable throwing things out there as "should be fine", but an assumption on your part is not good enough for 40 people to lay down $1500 over. I'm a firm believer that it's better to know than it is to assume.
if the frame grounds the tube and you want to leave the frame off why not just run a big wire from where the frame normally attaches?
I'm of the opinion that leaving the frame off is the worst of the possible options.
It'd be best to first find out if the frame will fit or not. Then if not: make a new one. Because as I mentioned before, going frameless means at least one person is going to neck this thing. It happens enough in cabs that are designed with a mech, nevermind loose ones if the wires are improperly routed (and since they're being assembled at home, seems like an easy oversight).