6SL7GT NOS/NIB RCA black round plate twin triode tube. 1957 vintage. The tube has been tested for new performance and the triodes are balanced. I will properly pack the tube for safe shipment and pay insured USPS postage with tracking number in the US. Same business day shipping. International shipping through US Postal Service International for actual postage cost and selling price stated on customs forms. 7 ounces packed weight.