2 GM Delco 6U7 Vacuum Tubes Valves Lot of Two March 14 2023 but the spine is in

but the spine is in fine shape with no loose pages

It measured 47/50 where minimum (65%) is 40/40 and 100% is 62/62

I am playing them (with adapters

These tubes have black plates

new in box RCA 6AD7G tube tested to spec on our Paul Hart-calibrated TV7/U

2 GM Delco 6U7 Vacuum Tubes Valves Lot of Two March 14 2023 but the spine is inThese two GM Delco 6U7 tubes were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. They tested (from left to right) as follows: 56 and 59 where minimum (65%) is 40. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE ANY QUESTIONS. 1. MOST FORMS OF SHIPPING EXCEPT