Using chassis on wrong type of tube

[alphadog808]

Hey guys,
   Just wondering as I never got a definitive answer...Is there any risk of hooking up a chassis to a tube that may not be matched for it?  Is the worst that can happen is that it won't work/sync up?  Or can you cause more substantial damage? 

[ed12]

well
the reason u never got a good answer is u ask too broad of a question
lets refine here
19",20",25" to ??
type of tube unit in question came from,then type of chassic u are hooking it to ?
are u using the same exact yoke.? or was the 1 that the donour came from a bonded type yoke ?
is it a isolated chassic? or a smps style ?
these question need to be adressed first
then u will get your answers

ed

[alphadog808]

Thanks Ed.  To be very specific.

MS8-29FTB chassis w/ matching tube(Toshiba a68kkn96x)
MS9-29SU chassis w/ matching tube(Hitachi a68KSA30X)

Are these chassis interchangeable with either tube?  Any chance of damage?

[ed12]

the tube will it is a68
#1 down
now are u going to swap yoke's ?
as they may tune a tad dif?
so what is the exact chassic #'s ?
1 tube is a tad more flat planer style then the other
ie the curve of the bell and front..no biggie expect the yoke
if u can please post a few pic's of the old 1 and new 1
plus a pic each of there chassic u want to swap

ed

[lilshawn]

it's not the TUBE that is the issue it's the deflection YOKE.

the yoke is a finely tuned coil(s) if the chassis isn't set up to drive the coil, it'll all go poof on you. the yoke coil on the tube is "tuned" to a particular frequency that must coincide with the signal put into it. if the signal isn't right, (and it doesn't take much to be off) you end up with all kinds of geometry issues. horizontal width issues, Vertical size issues...etc. etc. etc. the difference of a few milihenries is enough to cause all sorts of issues. a few more and the magnetic field doesn't properly form and the yoke burns out, and the chassis overloads and shorts out.

we are talking about a stream of particles PERFECTLY timed, flying along at 480,000 inches per second... which is 27,272 miles per hour... to time this signal perfectly to line up perfectly at the beginning of the line scan each time a line is scanned (to have a nice straight square picture) takes some SERIOUS timing. all the circuits need to be perfectly synced together.

you are going to have to source an induction meter (or scour the internet for data regarding the yoke impedance) and measure the yoke that replacement chassis came from, AND yours. if they are the same (or close enough) it will work. if it's way out... it won't work without modding the chassis or may not work at all unless you swap the yoke from the original tube.

EDIT:

nanao ms9-29 is a 0.300mh yoke

and grantspain posted on another forum:

ms8-29su is similar yoke to ms9-29

[ed12]

thk-u shawn i said that.
but i do love when u go all tech on there asses
if the yoke tunning is the same then #2 is down
next is the type of power feed
ie: isolation transformer :hot-type: or smps cold type.
next time the nick will understand the term details we need details

side note here
i got another pkg from ict today....
santa was very good to daddy

ed

[lilshawn]

Yes, I got a pkg from Kevin too    It's already come in handy.

/derail

the chassis are a little different...the MS9 is an SMPS so it won't need isolation. the MS8 is unusual...it doesn't look like a regulator type. maybe some kind of discreet component regulation? it may need isolation. running an SMPS monitor through an isolation trnansformer isn't usually a problem. sometimes they won't start up properly because the AC current is limited through the isolation transformer. in which case, you'd have to bypass it.

http://3.bp.blogspot.com/_eMti2g5RHlo/S9v1NtkLuzI/AAAAAAAAAi4/rNU8cSCuMgc/s1600/ms8schematic.jpg

http://4.bp.blogspot.com/--Pdee497vWc/TcPzL1o3chI/AAAAAAAABS4/CmdK-X62_KQ/s1600/MS9-Schem.png


EDIT: fat finger misteak for splelling.

[ed12]

ya the #1 i would not trust as a cold chassic
where the #2 i would,it is def. a smps

with #2 get rid of the iso trans it is simply not needed
for the #1 oh heck yes keep it

from what i can read out of the blog posts
the #1 is some werd arse thing with a trans for the secondary >low< volts
but the high volts >flyback< and such are still hot..strange way to get a horz base freq if u ask me..

ed

ps i will pm u
u will like this 1 also

[alphadog808]

thanks for the help guys, it's *way* over my head!     I guess my answer is to keep the tube and chassis together, as I know they work with each other.