Here are some 6SN7GT dual triode tubes for sale on eBay. Various
brands. Mostly used, but good older, tested, USA-made tubes.
RCA, General Electric, Arcturus, Tungsol, Sylvania, Emerson, Crosley
etc. etc. Take a look if you need a number of 6SN7GT tubes.
These are mostly set up in groups of 6 or so tubes. Thajnks for
looking...
http://www.ebay.com/itm/360589694653
http://www.ebay.com/itm/360589697374
http://www.ebay.com/itm/360589700264
http://www.ebay.com/itm/111010911690
http://www.ebay.com/itm/111010912957
http://www.ebay.com/itm/111010914446
http://www.ebay.com/itm/111010916004
http://www.ebay.com/itm/111010917817
http://www.ebay.com/itm/111010919612