KEN-RAD JAN- CKR- 6SL7GT VT-229 Black Plate Valve Tube NOS (K73)
KEN-RAD JAN- CKR- 6SL7GT VT-229 Black Plate Valve Tube NOS (M59). Tested BK 600 = 90/90 Hickok quality test 1900/1900 Hickok GM 1800/1600 Avo test 2.9/1.8 - 2.8/1.6 No gas shorts grid emissions