RCA Black Plate 6BK7 6BK7B Vacuum Tube Valve NOS NIB For Your Schiit 5V6GT Octal Tube One measured 65/66 while

Tube One measured 65/66 while Tube Two measured 69/64 where minimum (65%) is 56/56 and 100% is 87/87

Admiral-BRANDED 5V4G rectifier tube was tested on our Paul Hart-calibrated TV7/U

new in box US-made 6JD6 tubes in this lot

This perfectly-matched quintet of new old stock-testing Sylvania-MANUFACTURED 7A7 tubes was tested on our Hickok 800 for shorts

EIA Factory Codes: none

RCA Black Plate 6BK7 6BK7B Vacuum Tube Valve NOS NIB For Your Schiit 5V6GT Octal Tube One measured 65/66 whileThis new old stock, new in box RCA Black Plate 6BK7B tube tested to spec on our Paul Hart calibrated TV7 U. I have played it in my Schiit Audio Vali 2 headphone amplifier and it sounded great. This variety has black, winged plates with one rectangular hole per plate; copper support rods; shields between triodes to eliminate crosstalk; great flashing and goal post getters. BECAUSE OF THE BIZARRE, INTRUSIVE AND DRACONIAN GERMAN PACKAGING REGULATIONS AND