25" K7000 tube....how many neck pins?

SilverDuck

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I am trying to sort out a 25" K7000 that is being a pest. How many TOTAL neck pins should be on the tube? TOTAL pins, including "key" pin?
 
Mine has 8 + key pin, total of 9 pins. I looked and looked, and can't see a broken pin on the tube. Am I effed?
 
Any chance the 25K7000s had both size crt necks. I can't recall the size, but I am pretty sure its one of the major differences between the 19K7600 and the 19K7900 monitors. And I am also pretty sure that they had different numbers of pins as well. Do you have another monitor to compare it to. The larger size with the 10 pin was more common on the 19" monitors. Maybe you just have the smaller neck size... Just a theory.
 
I am 99% sure my tube only has 9 pins. Unless my eyes are lying to me....I don't have a broken off pin, so I have a total of 9 pins. One pin in the "key" position, and 8 in a circle.

Is this possible?
 
Just looked at a 25K7000 chassis I had setting on my stairs to rebuild. It has 10, 9 in the circle and 1 in the key. But it is the larger neck size. I still think their might be two sizes.
 
Both of my neck boards have 10 pin holes, but it looks like only 9 of the 10 are used.
 
I have never in my life read about, heard about, learned about, or ever even SEEN a 25" K7xxx monitor with less than 10 pins. AFAIK, they ALL are 10 pin tubes.

That said, the CR23 adapter for my B&K rejuventor/tester for these tubes only uses 8 wires.

See here:

http://arcarc.xmission.com/PDF_Monitors/BK_Precision_CR-23_CRT_Adapter.pdf

On my adapter, pins 4 and 12 on the tube are not connected to anything on my adapter. Hence the 'N/C' on the wire chart. (No connection)

So, if you you're missing pin 4 or 12, you should be fine.
 
My previous answer was based on a neck socket of a 25" chassis, which has 10 holes.

However, I just went and checked a known-good 25" K7000 tube, and it has 9 pins - 8 on the outside and 1 in the key. The 10" pin has a hole int he plastic, but no pin. This would be on the far right of the 8 if looking at it from the back...
 
You've just made my day. I was worried sick that I had yet another tube with a broken pin.

HUGE thanks to everyone who took time to answer. You guys are the best.
 
If that's the case my 2 25" 7000s are bad...mine both have 9 and work perfectly fine. A third that hit the ground and shattered..that also has a total of 9 pins. There's a place for 10...but one isn't there.

I have never in my life read about, heard about, learned about, or ever even SEEN a 25" K7xxx monitor with less than 10 pins. AFAIK, they ALL are 10 pin tubes.

That said, the CR23 adapter for my B&K rejuventor/tester for these tubes only uses 8 wires.

See here:

http://arcarc.xmission.com/PDF_Monitors/BK_Precision_CR-23_CRT_Adapter.pdf

On my adapter, pins 4 and 12 on the tube are not connected to anything on my adapter. Hence the 'N/C' on the wire chart. (No connection)

So, if you you're missing pin 4 or 12, you should be fine.
 
If that's the case my 2 25" 7000s are bad...mine both have 9 and work perfectly fine. A third that hit the ground and shattered..that also has a total of 9 pins. There's a place for 10...but one isn't there.

I have 3, and all three have 10 pins. I've worked on a half dozen more, and I don't recall looking at them. Perhaps they had 9. Weird.

Okay, so I guess the 25" k7xxx monitors have 9 pin necks. Who knew?
 
Mine has 9 pins. I asked this very same question a few months ago on these forums. I also posted pictures of my 9 pins because people didn't believe me.
 
This is an old thread, but it was the best one I could find on here that provided information about the number of neck pins on a K7000. I have done several K7000 tube swaps lately and I just wanted to add to this thread by saying that the 25" K7000s can use both 9 pin and 10 pin tubes. I have been swapping them back and forth without issue.

If any of you gentlemen have a standard K7000 monitor with screen burn, you are doing yourself a disservice because a tube swap can help you get a fantastic picture.
-Kyros
 
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It's very simple. Some manufacturers, notably Thomson (which took over RCA), don't put pin 12 on their CR23 tubes, hence the total pin count is 9. That pin wouldn't be used anyway as it is internally connected to pin 11 (when present).

If you read EIA 553 on the tube label, that's a Thomson tube even if the name on the label is different (it's the TV maker's name).
 
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