Can a Tube off of a WG 25K7193 Chassis Swap onto a WG 25K7191 Chassis?

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Can a Tube off of a WG 25K7193 Chassis Swap onto a WG 25K7191 Chassis?

Any reason this couldn't work?
 
as long as the neck fits, and they are both the same resolution (CGA), it should be fine. you always want to meter the yokes if you arent swapping them to make sure they are similar.
 
There is what appears to be a medium red hookup on the k7191 - a second 4-pin connector. I would be hooking up to that tho. But I will meter the yokes and check they are the same socket as well.
 
Finally circled back on this, and ohmed the yokes.

K7191 tube (burned tube) - red/blue = 1.8, yellow/green = 5.8

k7193 tube (desired replacement) - red/blue - 1.8, yellow green = 10.3

too far off for the tube from K7193 to replace the K7191 tube?
 
pictures of chassis.

medium res K7000s had a small board mounted above the flyback with a red wire that goes into the deflection board and a white wire that runs to one of the neck socket pins that's lifted out of the neckboard.

and read this: https://forums.arcade-museum.com/showthread.php?t=392981

some people will tell you "it's ok" but it really isn't. the standard res K7000s were uniform, all interchangeable across tubes. ohming the yoke is improper, but you obviously have a difference there, so I wouldn't do it.
 
K7191 - chassis that will be getting monitor, if it works:



K7193 - chassis from which monitor is being taken to pair with K7191, if it works:



 
I have both a 7191 and 7193 on my bench right now.

After reading this thread, the 7193 may be a medium resolution chassis.

Anyway my point for posting is that the 7191 is an 8 pin neck and the 7193 is a 10 pin neck. I have no idea if all of them are like this though.
 
I have both a 7191 and 7193 on my bench right now.

After reading this thread, the 7193 may be a medium resolution chassis.

Anyway my point for posting is that the 7191 is an 8 pin neck and the 7193 is a 10 pin neck. I have no idea if all of them are like this though.

7193 is the native chassis in my big blue, and it's not medium res. Running CPS1 and CPS2 board.

7191 is running in my Jaleco Lo Pro (also appears to be the native chassis at least as far as I can tell being a new owner the cab). But, it too is low res. Currently running Rush N Attack via a Konami to JAMMA adapter, in it.
 
I have both a 7191 and 7193 on my bench right now.

After reading this thread, the 7193 may be a medium resolution chassis.

Anyway my point for posting is that the 7191 is an 8 pin neck and the 7193 is a 10 pin neck. I have no idea if all of them are like this though.

the 7193 was a standard res. the medium res has a 76xx part number I think, which I can't remember off hand. I haven't encountered any 8-pin 25" K7000s, only the 19" ones. sometimes you can swap around neckboards, but the K7000 received a few variants of those too, and at a point in the line, they're NOT swappable.

that little resistor gadget board is probably not even connected to anything. there were a couple of those that were used for something with the power I think, but WG wound up disconnecting them. Buffett probably knows more about them. the medium res board is a flat squarish one, and like I said before, has red and white wires coming off it.

as for the yokes being different, that's a little puzzling. supposedly you have a wider tolerance on the vertical section of it though; it's when the horizontal is way off that you'll have issues.
 
the 7193 was a standard res. the medium res has a 76xx part number I think, which I can't remember off hand. I haven't encountered any 8-pin 25" K7000s, only the 19" ones. sometimes you can swap around neckboards, but the K7000 received a few variants of those too, and at a point in the line, they're NOT swappable.

that little resistor gadget board is probably not even connected to anything. there were a couple of those that were used for something with the power I think, but WG wound up disconnecting them. Buffett probably knows more about them. the medium res board is a flat squarish one, and like I said before, has red and white wires coming off it.

as for the yokes being different, that's a little puzzling. supposedly you have a wider tolerance on the vertical section of it though; it's when the horizontal is way off that you'll have issues.

For the record, I may be way off with the model #'s. I will look tomorrow and post a couple of pics here. I am far from a k7000 expert. I've worked on maybe, 20 of them total.
 
googled around, found an Atari manual, the medium res was the K7635. I knew 76 was in there somewhere.

and then they used that model again later for the 33" U5000, K7600. they did that a few times.
 
So, I guess my question is: is there any harm in giving it a try (7193 tube on 7191 chassis), based on those measured values?

If there's potential harm to the tube, then I could try either of the 7191 tubes that I have on a 7193 chassis, if that will prove anything. Both 7191 tubes have significant burn, and I don't care if they get toasted as part of the experiment, and again if it can ultimately prove that the tubes and chassis are cross-compatible.

If there's potential harm to the chassis, well I'd rather not set myself up for more repairs. At that point, I guess it's out to CL and thrift shops to try to find a good donor tube.
 
I'm more confused that there's such a variation between them. the one with the 5 ohm vertical actually sounds more like U5000, though I'm not part of the yoke ohming society, so I don't remember anymore. :p

worst case scenario I think the vertical size will be loopy. I think I mentioned before, a variation like that on the vertical side is ok, horizontal it wouldn't be so much.

I've never heard of the K7000 having different yokes. can you find the numbers off each and post them here?
 
Here are pics of the yokes. Not sure if these are the numbers that are wanted. If not, let me know where I should be looking.

One thing that caught my attention - the K7191 tube has not convergence strips or yoke wedges.

K7193:



K7191:

 
Thats an odd looking yoke, that second one. Maybe someone subbed a tube at onee point. K7000's seem to run on a variety of tubes. I can tel, you that we don't differentiate between 7191, 7193, etc on the route. 25K7000 is how we list it amd have never had issues.as for the yoke impedance.. well someone else will have to comment on that I have stuck 7000's on a couple odd tubes and had no major problems.
 
Wells Gardner K7000 WGR2570-U1GS30K 054A7193-001 025A1341-001 009A2911-001 088X0407-506 25" CGA 15.7KHZ k7000 UNIV FRAME REFURB

From http://arcadecup.com/

009A2911-001 == 9A2911-001

Not sure about the 7191 yoke. Maybe someone did a tube swap?
 
Thanks, guys. So, the 7193 tube came out of my big blue. I have no reason to believe it wasn't the tube that originally shipped in the cab, so makes sense it is something that is researchable.

That 7191 tube tho...hehe...picked up this past weekend as part of a 2 monitor pick-up off craigslist - this 7191 and a 7197. Let's just say things were blazing in the house and came wafting out into the driveway when the garage door was opened for viewing of the monitors. The 7197's tube had a neck that was mangled, but the chassis seems to be in good shape. The 7191 pictured here had a service tag on it from "Speedy Service and Repair", a remote board with 3 broken VR's that looked like it had been stepped on, and an anode cap with a crack in it. Combine those oddities with the unique tube that has significant burn on it...well I'm just hoping to salvage the chassis's at this point either for myself or for someone else that could let them see new life. And the 7193 tube I'm hoping to put in my Lo Pro, which has a K7191 in it. A bit of a tangled web of K7000 testing and re-purposing here, I suppose.

The 7191 tube pictured is a "WGEC" part number. I'll see if I can get a picture of that tonight, in case anyone's interested. I'm always curious about the possible history of parts.
 
Look to see if the bolts/nuts mounting the tube ears to the frame are rounded or anything else that might indicate a tube swap.
 
that looks like a Polo yoke because of its boxy base. I can't tell because the picture's zoomed in on the numbers, but it looks like there's no rings. Polos didn't have rings, they had some magic box that did the convergence. and the Polos have 4 pins that stick directly out the top, some variations had the yoke wires connected to them with plugs. someone at least had the decency to replace the yoke plug with the correct one if that's the case.

that'll explain why the ohms are different.
 
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