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This was curious, because with NOS, I never had this. So I let the tube run on the tester, and the next day it was testing weak. The jj were moved out of the building and reinstalled at a factory of a man called Jan Jorgo, better known as JJ.
Oh well, I thought one bad tube out of 20 can happen.
E88CC / JJ :: JJ Standard :: JJ Tesla :: Tubes :: Banzai Music GmbH
Then after the initial heat-up, the Tesla’s change their readings only very little, and give a totally stabile reading after just minutes. I though they need some more burn-in perhaps.
Then I let one tube warm up, and apparently it started to reduce plate current slowly.
What a quality this is! In the below picture you can see this difference clearly.
Well, then everybody is happy. Bidders were fighting for them. These are little jewels. I wrote in the Auction why I sold them, and they were with the option to return if not satisfied.
On my tube tester Metrix U61B initially they tested very nice. The next difference I noted, are some costs savings on the shielding. How typical for Ebay. Many people thought this situation would always stay that way, and the TESLA management thought so too. This is great, because the center anode plate is already hotter than the outside anode plate.
Then they keep just this value no matter how long hours or e88cf I let the tester run. First of all, the needle of the tube tester goes up faster as with the JJ’s, and that gave me a good feeling.
Also wires, and nickel technology came from Tesla plants that are all d88cc now. Most of them have yellow printing.
Russians and Chinese tube factories raise their prices twice a year due to higher energy costs and higher cost of all kinds. There was enough NOS around. jh
E88CC / 6922 JJ
I got a higher price than expected, and the buyer was satisfied he wrote me. Identical tools are used Another difference is in the part numbering. The used materials e88cf are not the same. These are from the ‘s. Only the machines are the same, and in the Tesla days they were new, and now they are old.
JJ Electronics 6922/E88CC Vintage Tube
The shielding plate was coated e88cd, and is used to transport the heat out of the tube center. I sold this lot where it belongs: So is is used a cooling fin.
Same as with all E88ccc when I see that. Here you see a close up of the gold plated grid bars coming out of the mica. So obviously they did not use just gold plated grid wire, they gold plated the complete grid after it was made.