A beautiful quad of vintage RCA 12AU7 tubes. Conn organ labeled tubes. Date codes are all from early 1956 (4th and 13th week). Square getters, nice long plates, black plate construction. Getter flashing is strong with minimal discoloration and/or fade. These used tubes have been tested for mutual conductance. On my Heathkit TT-1 tester they read 1150/1150, 1150/1250, 1200/1100 and 1200/1100. A reading of 710 would represent the minimum recommended value. The test fantastic. I dont charge for paypal and shipping is $5 via usps..