RCA Black Plate 12BZ7 Vacuum Tube NOS NIB For Your Univalve Or Bottlehead In Honolulu new in box milspec RCA

new in box milspec RCA VT-200 VR 105/30 / 0C3 regulator tube tested to spec on our Paul Hart-calibrated TV7/U

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

This milspec Brimar CV4014 / 6064 / EF91 / 6AM6 tube tested to spec on our Paul Hart-calibrated TV-7/U

the title song defined the summer it was released

This lot of three Super Silvertone 6K7G tubes were tested on our Paul Hart-calibrated TV7/U for shorts gas and transconductance

RCA Black Plate 12BZ7 Vacuum Tube NOS NIB For Your Univalve Or Bottlehead In Honolulu new in box milspec 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