Tube Pin-Outs

D_Harris

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I have a television repair shop near me and I spoke with the owner who said that he had some 19" tubes he could give me.

So I have a question. If the pin-outs of a "new" 19" tube are the same as the original 19" tube will said tube work?

I have WG4900, WG4600, GO7 monitors that need new tubes.

A pointer to the pin-outs of these tubes would be appreciated.

Thanks.

Darren Harris
Staten Island, New York.
 
Short answer - no
Having the correct number of pins is not the only factor but is one of a few factors.
There are a few charts out there that cross reference tubes. (suitable replacements)
http://ionpool.net/arcade/tech/CRT_Cross_Reference_Chart.pdf

You may get lucky and have the donor tubes yoke match the original yokes impedance. If so you drop it in and plug it in. If not you need to use the old tubes yoke and then convearge the new tube.
 
Okay. These are the things you need to check when swapping a tube:

a) the new tube must have the exact same number of pins on the neck as the old tube.

b) the "key" on the neck of the old tube must match the "key" of your neck socket. The "key" is the plastic around the focus pin. Some tubes like the K7000 have a different sized key than the G07's, 4600's, 4900's etc.

c) the diameter of the neck on the new tube must be the same size as the old tube. otherwise your yoke won't sit properly.

Now, all of the above can usually be checked by seeing what type CR adapters is required for the particular tube number. You can check the list here:

http://www.bkprecision.com/support/downloads/pdfs/CRT_Setup_Chart.pdf

The tube normally found on the G07's, K4600's, and K4900's is a 19VJTP22. According to the chart in the link above, this uses a CR-23 adapter. So, if your new tube also uses a CR-23 adapter, then it will work as a donor tube. Usually, if the neckboard plugs on okay, then the tube will work.

However, there is one more thing to check:

d) If you check your old tube, you'll find somewhere on the back of the tube some raised numbers (you can feel them molded into the glass of the tube) that will say either 90 or 100. This is the deflection number. Your new tube must have the same number, otherwise your toke won't sit properly against the tube, and you'll have constant degauss and convergence issues.

And as was mentioned before, this is for swapping the tube only. The chassis must match the yoke, and most TV yokes aren't compatible with the chassis. Keep the centering rings that come with the TV (unless they are part of the yoke), mark their position before removing, pull off the TV yoke and put on the arcade yoke, reinstall the centering rings to their original position, and install your chassis.

If I forgot something, I'm sure Ken will add it...
 
I'll also add tube "angle"....100 degree tubes versus 90 degree tubes. Once in a blue moon I'll run into a TV with a 100 degree tube.

Edward
 
I'll also add tube "angle"....100 degree tubes versus 90 degree tubes. Once in a blue moon I'll run into a TV with a 100 degree tube.

Edward

I thought I hit that with "d)". And I found a 100 degree tube recently when trying to swap a TV tube into a broken U3100....
 
I thought I hit that with "d)". And I found a 100 degree tube recently when trying to swap a TV tube into a broken U3100....

I was hoping to get lucky and come across a 100 degree tube. I'd like to try one with a WG6100 chassis.

Has anyone logged the make/model of the TV's with these tubes?

Thanks.

Darren Harris
Staten Island, New York.
 
I go to Goodwill and write down the model #'s of the TV's, then come home and search the internet to see if anybody has the tube # listed for that model, then check to see what CR adapter it uses. If it matches and is 19" instead of 20" (or 13" instead of 14"), then I go back and get it.

I do know that a Magnavox 13" TV with a model number of RX-whatever (seen several with different following numbers but the same RX identifier) has the exact same tube as the K4800 (although the yoke is different). I don't have a pic of the TV, but a friend has one so I might get a pic of it if anyone cares.

You might place a CL ad asking for free 19" TV's - working or not - and offer to pick them up so people don't have to go to the trouble of taking them to a recycling center. Then you can get rid of the ones that don't work, and keep the ones that do...
 
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