picture tube swapping?

[minniescar]

 As ive said before im pretty new to this so if i ask to many questions i apoligize in advance. Anyway ive looked around on the web and found a few sights that show people swapping picture tubes from an old tv to an arcade monitor chassis , but im thinking it cant be that easy. No where on these sites do i see any specs or what tube will work with what chassis or any specs that need to be checked and made sure they match. Is there any info on what tubes are compatible with each other?

 I would beleive a 19 inch tube is a 19 inch tube but i did have a recent run in with a Nanao MC2000 which is a 100 volt tube so all tubes cant be the same. I do find it odd that the two fuses on the Nanao MC2000 are listed as 125 volt though, anyone know why?

[kjoel0123]

First off why would you try to put a tv tube in an arcade? Does it state any where on the tube that a transformer is needed? older arade monitors must use an isolation transformer to step down the voltage to 100v. If you plug a tube in without a transformer then you blow up the monitor board, caps/etc.... Next all newer monitors do not use an isolation transformer, so any outlet will do fine. If you need an isolation transformer I have one for sale cheap.

[SirPeale]

First off why would you try to put a tv tube in an arcade? Does it state any where on the tube that a transformer is needed?

The isolation transformer is for the chassis, not the tube. 

Yes, you can use an old TV tube in place of an old burned tube.

Not all of them will work, you've got to match the pinout of the tube.

[minniescar]

 So its simply matching the pinout? I would think there would be more of a variance in tubes even if they where manufactured in the same time period.

First off why would you try to put a tv tube in an arcade?

 If you dont own a rejuvinator and you cant find anyone local to rejuvinate an old tube or if the tube has serious screen burn.

 As for the usage of an isolation transdormer i understand that but on the Nanao MC2000 which is clearly stated as being 100 volt why are the two fuses on board marked as 125 volt? Just seems a little odd to me.

[Ken Layton]

Fuses come in certain standardized voltage ranges: 32 volt, 125 volt, 250 volt, and several higher voltage ranges. Yours has 125 volt ones because that's the closest range.

[tta583]

There are a few things to consider on a tube swap.  (Not, by any means an expert....I just read a lot..and we ALL know everything on the Internet is true).

First off is pin compatibility.  That has been mentioned in this thread.  This is not necessarily a physical fit issue in as much as it is physical fit AND pin function.  Some folks look at docs for a tube tester/rejuvenator to quickly figure that out.  For example, if 2 tubes both use the same B&K socket number then they are pined the same.  I have a Sencore tester.  I can look up 2 tubes and see if the setup for my tester is the same.  (My Sencore uses fewer sockets and accounts for different pin outs via rotary switches to set the pin function.)

Second is yoke.  Generally, as I have seen, a typical yoke is classified, loosely, based on the impedance of the vertical windings.  High or low.  Here is where folks typically go to figure this out:
http://www.8liners.com/datatech/monitor.html

Sooooo if you have a tube that has the same physical and functional pin arrangements with a yoke that matches the impedance requirements of your chassis then you have a good swap candidate.  Will it necessarily work?  No.  From reading various posts I would "guess" you chances for success would be around 50%.  Success meaning you get a nice geometric (squares are squares, straight lines are straight lines) picture.  Say about another 30% of the time you get a good pic.  It’s not perfect, but good enough for government work.  The rest of the time you get something but its way distorted.  The reason for the variations is the differences in the yoke.  2 similar impedance yoke are not necessarily interchangeable.  There are many other characteristics beyond that of its impedance.  A yoke type would be matched to a chassis type so that these electronic characteristics jive.  In a situation such as this you could then swap over the yoke from you bad tube to the good tube.   To do that you have to disturb the purity rings which means you will have to re-converge.  That is a whole other can of worms.

[daywane]

hay minnescar
you have mail 
you asked were in lawrenceburg I live.
Ninevah (us127 and Main St.)
all cabs are still for the taking ( except the ms pac)