Genalex Gold Lion KT88 6550 Black Plates Top Cup Getter Tested Excellent Matched
These tubes are carefully tested on my TV-7/U at 60-62/44 min good (44=65%; 66-68=100%) and 76mA-76mA (reaching to 80mA-81mA after 15 minutes burning up) as shown in the last photo. They sound wonderful on my Mc 275.