8 - Vintage 1960s Sylvania 6SN7GTB Preamp Tubes 6SN7 Short Bottle, Chrome Top, Black Plates - Test Like New Start Price USD 69.99 Current Price USD 69.99 Time Left - Bid Count 0 Buy It Now Price - Reserve Price - Start Time Saturday, November 29, 2008 End Time Saturday, December 06, 2008 Location IA See more about '8 - Vintage 1960s Sylvania 6SN7GTB Preamp Tubes 6SN7' Description (8) Vintage 1960's Sylvania 6SN7GTB Preamp Tubes. Short bottle, chrome tops, black plates. Tested on my calibrated TV-7D/U tester for shorts, gas & mutual conductance. Tubes test like new @ 90/92, 92/98, 98/108, 100/102, 102/102, 100/104, 104/108 and 106/110 where the minimum good value on the TV-7 is 50/50 and new value is 90/90.  Place a Bid!