6SL7 GT TUNGSOL BROWN BASE MATCHED PAIR,,NATO specs TV7 tested
(TWICE TESTED;. 2nd)INDIVIDUALLY LIVE AUDIO TESTED ,THIS IS THE MOST IMPORTANT THAT YOU CAN DISREGARD ALL OTHER TEST BUT NOT THIS ONE, NO SPUTTERING ,NO CRACKLING, NO HUM and NON-MICROPHONIC USING MODIFIE D DYNACO PAS II.