A very nice quad of vintage yellow-label Sylvania 12AU7 tubes. Conn organ labeled tubes. Date codes are all from early 1958 (13th week) .On my Heathkit TT-1 tester they read 1150/1150, 1150/1200, 1200/1150 and 1200/1200. A reading of 710 would represent the minimum recommended value. They test 'as-new'. Square getters, nice long plates, These tubes have very dark grey plates almost very dull black plates or charcoal in color construction. They sound incredible. Getter flashing is strong with minimal discoloration and/or fade. I don't charge for paypal and shipping is $5 via usps..