Description
These are a pair of identical new old stock Sylvania 6SN7 GTB dual triode tubes. Chrome tops, black plates. I did a bad thing. I accidentally sprayed the first one with alcohol to clean and all the writing came off. Both have/had the same bm date code. Tested on a calibrated TV-7 as follows with 50 as a minimum value The blank one tested 92/92 The one with writing tested 90/88