Description

30 Day unconditional guarantee. This listing is for 2 vintage 1960s Sylvania manufactured Baldwin or Conn 12AU7A non-microphonic vacuum tubes. Matched to less than 10 test points per tube. Checked for noise and microphonics at V1 in a SE tube amp. Tubes have Long grey plates with top halo getters, and copper support rods and good getter flashing. Tube pins are straightened and cleaned with a fine brass brush before testing. Tubes are tested on either a calibrated TV7 or calibrated BK707. Test scores will be at least 90%NOS for either tester. Also tested for shorts and gas. Test scores provided for each tube on their tube box. Within each tube, test scores match within 10 test points; first tubes sold will match much closer within 5 points or less. TV7 NOS test score is (86,86), Minimum good is (56,56) BK707 NOS test score is (100,100), Minimum good is (65,65). You will receive 2 tubes and 2 tube boxes for the listed price. Thanks