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Monitor Swap Question
Question from Daniel: Hi guys, first off I just gotta say thanks for all your helpful videos that you’ve made! Been a lifesaver more than a few times, so thank you!
I’ve got two questions that I’m sure are easy ones for you, but I’m just not 100% sure about them after doing some research. I’ve got a Wells Gardner model no. 25K7191 chassis with a 25″ Zenith monitor that is VERY dim (I understand that this could be due to several different reasons, but, for the sake of my question lets just say that my CRT is toast and I want to do a tube swap with a Sanyo 25″ television that I have).
MY QUESTIONS:
#1. Considering my yoke resistance readings (see below), can I safely drop the Sanyo tube into my cabinet with its own yoke? Are its readings compatible (specifically its vertical of 6.2)? I’ve seen some people on the net say that vertical readings for a K7000 can be around 7.5 and then I’ve seen others say it can’t be lower than 13. That’s where I get conflicted in my search.
#2. Check out the pics of the two necks on my tubes. They’re the same size, and my original monitor has 1 less pin BUT the neck board easily fits on both necks and both tubes have a socket # of CR-23.
Below is the info I have for the 2 monitors:
I looked up both model numbers and found that they both have these same specs: Heater = 6.3v, G1 = 50v, Neck = CR-23
Old original 25″ Zenith monitor: MODEL NO. G-A63ADG25X – This neck has 9 pins (see attached pic)
Its yoke resistance reads Horizontal = 2.1 and Vertical = 11.8
Sanyo TV 25″: MODEL NO. MVA63AEH20X (or just A63AEH20X?) – This neck has 10 pins but the neck board for the Wells Garner chassis fits perfectly onto this neck, just like it does on the original neck. It’s yoke resistance reads Horizontal = 1.5 and Vertical = 6.2
My chassis is a Wells Gardner model no. 25K7191
Thanks again for all your help!!
– Daniel
1 answer
Daniel,
First off, thank you for your kind words about our videos. We’re glad you find our content helpful. Make sure you also check out our blog posts and our podcast for even more useful information to help you out with your future projects.
As for your questions…
1.) The vertical yoke readings between the 2 tubes are close enough to give it a shot. Usually we say if the difference is 10 or more you need to swap the yokes but 5.6 might be good enough for it to work without doing that. Of course, swapping yokes can be a lot of trouble but it’s sometimes an easier alternative than locating a tube with a yoke that’s an exact match. We say try it out with the current yoke and if you have issues swap it with the yoke from the original tube.
2.) Like with the vertical yoke readings, as long as the neck board fits then it’s worth a shot. One way you can verify if the necks match is by using a tube rejuvenator manual to see if the socket numbers are the same. We like the B&K Precision 470 manual specifically but any tube rejuvenator manual should work. The manual should have a number system to note what type of socket a tube uses. Simply look up both tubes in the manual and see if the socket numbers are the same. If they are then it’s a match! Of course, since the neck board easily fits on with minimal effort, chances are good that it’s compatible.
Hope that helps. Thank you for your questions and good luck with your repair.
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