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

46 and 52 where minimum (65%) is 35

Transconductance readings are 15

Tube One measured 62/72 while Tube Two measured 70/63 where minimum (65%) is 50/50 and 100% is 77/77

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