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#1
03-02-2021, 12:48 PM
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Yep,..kind of a let-down when someone else has been hacking away underneath. I hope you can muddle your way through it ok. There is a pair of "outer" knobs on E-Bay right now. They look a little warped though. Have you checked the 7JP4 on a CR-70 ? I'd be curious to know what the "cutoff" response is with a picture that looks that good.
https://www.ebay.com/itm/ADMIRAL-Tub...3bd8%7Ciid%3A8 Tony 
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#2
03-02-2021, 04:11 PM
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Quote:
 As for testing the CRT, I dug out the CR-70 since I was a bit curious too. Cutoff is mediocre and does not reach the "black box" even with the control maxed, however emissions are quite strong:   I have heard much about how CRT testers cannot accurately test these electrostatic tubes, so I am taking it with a grain of salt. The tube obviously has decent contrast functioning inside the set in any case 
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When you lower your standards, you set a new standard! ISO: Mitsubishi 6CT-338, Sony Chromatron 19C70/100, Yaou "Colornetron" GTC-9, etc...
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#3
03-03-2021, 07:13 AM
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Thanks for posting the cutoff response pics. I have accumulated 3 of these sets. I've tested all 3 crt's. One has excellent cutoff with lots of meter swing. The other one is just like yours. It barely comes up to the same spot you show. The last comes up about halfway to where yours shows. I was thinking that only 1 was restore-able that would produce a watchable picture, without having to invest in another good 7JP4. I've seen a lot of Bob A's video's to kind of know what to expect. Hopefully you will keep us up to date with your progress. I guess unless you swap all crt's into a good working set, you don't know how they are going to perform. Cheers.
Tony
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