Whats different on a K7000 25" chassis vrs the 19"

Black Matrix

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Whats different on a K7000 25" chassis vrs the 19"

The question is self explanatory. I bought a nice chassis on ebay that was supposed to be a 25" chassis, but I am relatively sure its the 19". I was thinking about converting it to the 25". So what parts are different. I know the voltage regulator is different and that big hawking ceramic cap that hangs on the side is even bigger on the 25". Has anyone ever done this conversion and is it very difficult. If anyone has a parts list for the conversion, or knows of a good post talking about how to do it, I would appreciate it. Thanks in advance.
 
no its not lol..

19 inch shoudl have a "449" on it.. 25 incher will have a "513" or "531" on it


theres too maby differences to make it work, been down that road before..

i mean, it prolly could be done but itll take a TON of work..

i think mod knows, well heve to hope that he will chime in...
 
Well, the biggest and most obvious is the neckboard... most 19" chassis' seem to have the small neck, while the 25" usually have the large neck (though I believe the other way around is possible). Other than that, I know the voltage regulator is different for sure, I can't think of other differences at the moment, but I'm sure they're there.

DogP
 
19" will either have an 8-pin or 10-pin neckboard. All 25" (as far as I know) are 10-pin.

And the 25" versions tend to have the adjustments on a remote board while the 19" versions have the pots on the chassis.

I'm sure I could find lots of differences if I compare a manual for the 19" with a manual for a 25"....
 
As far as the K7000 19" goes, I know there were two varieties. One was built with the smaller neck size and had a different number of pins. The other had the larger neck that was the same as the 25". One model number was 19K7601 and the other was 19k7901. I don't recall which was which at the moment. But if you swap the neck boards, I think those are an easy conversion. Of course the one I swapped stayed stored for about a year and when I tested it. the neck fell off. Of course, that was probably just coincidence. As for the chasis of a 25" vs. the 19", the 19" is P447 and the 25" is P538 IIRC. I think there is some slight differences on how the circuit board looks, but I think it performs the exact same functions. The only thing I could think of that you would need to change is adding some extra caps to widen the picture and change the Voltage Regulator. Bob Roberts addressed the width cap trick in one of his pages. I just figured someone knew for sure.
 
HEH i was kinda close on numbers lol..

yes i have swapped neckboards back and fourth myself no issues so far, its a pretty easy swap
 
I honestly doubt you could use a K7000-19 on a K7000-25 without killing yourself with frustration in the conversion process. Voltage regulators are different. There are some different resistors thruout the chassis. The heat sink for the vertical IC is different. Then there is the neck board issue. Add all that up with the at least 4 different styles of K7000 chassis and you get a big mess. Why not just buy a chassis off eBay like I do and/or trade for one? I think you will be a saner person for it. The manual does not list all the differences in all the chassis BTW so if anyone has done this swap, I'd like to see it documented.
 
My buddy and I have put 19" 7000 chassis into 25"s. Also, I currently have a 13" 7000 chassis sitting in my 19" for Street Fighter. They work.

Now whether or not it's good to run them like that...I have no idea. But so far so good.
 
ive tried it before myself but pic was never big enough!!!!

i wish i could make one work myself, i have a pile of 19's buti need a 25er bad...
 
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I honestly don't think it should be that big a deal. And I would really like to see it documented as well. But I would figure it might be as few as 5-10 parts. The neck board isn't that big a deal. As stated before, one is the same, the other is just too small and is missing a pin or 2. I just figured someone had surely tried it before. I looked at the complete parts list in two of my manuals a while back and could only find a couple of resistors and transistors different on the board. Of course, that was a while ago and I've slept since then.

I honestly doubt you could use a K7000-19 on a K7000-25 without killing yourself with frustration in the conversion process....The manual does not list all the differences in all the chassis BTW so if anyone has done this swap, I'd like to see it documented.
 
just tried one again myself it goes tall enough for the most part not perfect but acceptable, real problem is its wayyy too narrow..

and on top of it, you can hear the thing just screaming(high pitched squeal) trying to power that big tube...

it works, but it aint happy

whih cap can beswapped to halp change width??

id like to monkey with this some more...
 
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