RCA Black Plate 12BZ7 Vacuum Tube NOS NIB For Your Univalve Or Bottlehead In Honolulu This matched pair of RCA

This matched pair of RCA steel plate 6AK5 tubes was tested on our Paul Hart-calibrated TV7/U tester for shorts

the title song defined the summer it was released

This matched pair of Sylvania black plate 6CL6 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

These tubes have 8Y2 D3L3 and 8Y3 D0C3 date/provenance codes

46 and 52 where minimum (65%) is 35

RCA Black Plate 12BZ7 Vacuum Tube NOS NIB For Your Univalve Or Bottlehead In Honolulu This matched pair of RCAThis new old stock, new in box RCA 12BZ7 tube tested to spec on our TV7 U. It measured 26 28 where minimum (65%) is 18 18 and 100% is 28 28. It has black plates; an O getter; steel support rods and outstanding flashing. I have listened to it in my Bottlehead Crack headphone amplifier and it sounded great. It is listed only as a good substitute for the 12AX7 which is only a fair substitute for the 12AU7 the recommended preamp tube for this headphone