Matched Pair SYLVANIA JAN CHS 6SL7GT VT-229 Valve Tube Tests Black plate dimpled foil getter Tested BK600 89/89 NOS test Tested Hickok 1-117-B = gm 1700/1650 mhos new test Quality test 1900/1900 mhos new test Avo test by others 3.5/1.9 -3.6/1.9 new test New 89 up
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