Two, new in box, Tung Sol 6SL7GT tubes. .These are obviously, vintage US made, Tung Sol tubes, not the modern day Russian made reproduction/re-issue of Tung Sol tubes. Grey, round plates. Tested on a Hickok TV-3 military tester that has been calibrated, just to make sure. Firm bases, excellent silvering. Tubes are matched for dynamic gain and structure- test at 1875-1875 and 1875-1875 where pass/fail is 1100 micromho. Tubes have the same exact structure inside and out, havi...ng date codes of "322539-3" and "322527-3", the 39th and 27th week of 1955Many other lots of tubes for sale this week.Shipping is free within the continental US. Elsewhere- exact postage only, no packing fee.