Excellent matched pairs of 1950's, Sylvania 6SN7 GTA chrometop blackplates. Wonderful vintage tubes. Wonderful 3d imaging and renowned for being bulletproof driver tubes, a steal at this price. These are a no brainer if your system is a bit too etchy at the top end, or, worse, you are mired in new production tube sound; a very inexpensive way to get the sound improvement you want. These all tested between 2250/2350 both triodes...nos is 2600...very strong readings great for tubes that are beyond 50 years old. Great buy for you tube rollers and a very inexpensive way to improve the sound of your system. Buyer pays 3% paypal. All conditions firm, meaning they will only sell for the list price and will not sell 'shipping included'. Regular shipping to US $10.....4 day tracked, $20, Price is per pair, thanks.