Are you sure? They were temporarily out of product but I think the EATS are back in production now. I just got some ECC83s for my Doshi (without the damping rings) and they sound very good. Pricey though.
1. Regarding availability of EAT 6922: I tried to buy them at the end of June and I was told that they are NOT available and that they don't know when they will be. I mailed Jozefina Lichtenegger (CEO of EAT) yesterday and she told me that these tubes are available again.
2. Regarding EAT 6922 origin. Again according to Jozefina Licthenegger, these tubes are "specially selected NOS tubes". EAT 300B and KT88 are produced in their factory in Prague. I will ask her again about the origin of 6922. With the new stock, maybe that has changed too....
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