Rare pair of unused old stock National Union 6SN7GT in beautiful condition.. Matching 1954 date codes. Fully tested on a calibrated Hickok 539C tester for gm, gas and shorts as well as listening tested for excessive noise and best sound in a super high-end custom 6SN7 preamp. These tubes came from the recently acquired collection of a former aeronautical lab of which contained dozens of 6SN7's and other preamp level tubes in unused or slightly used condition. See my other listings for more tubes from the same collection. Will accept Paypal with no fee or postal MO. $5 shipping total in the US. I would prefer if you have SOME previous positive feedback on a known trading site such as Agon or Ebay etc.. Please email at aroc228@gmail.com
Please see my feedback under the same name on Audiogon.