There is an auction http://www.ebay.com/itm/290922533510 (not mine auction) where yet again seller states that the tubes are NOS. This auction tripped me to finally come over my embarrassment and ask: Could somebody explain me how the discoloration around cathodes is supposed to appear during the tube operation? I understand that the common knowledge is that only used B7971 have it. The new ones should have a uniform back-plate.
Marcin

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