I picked up an assortment of 22 6sn7gt tubes and in the mix was 4 gray glass RCA’s, 2 black glass tung-sol and 2 ken rad black glass.I tested them and they all test strong.I put the tung sol in the preamp and the a single ken rad in the amp and the bass response is the best I have had with these pieces.I was thinking of selling the amp and preamp but not now.
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