I have a B-2000 I was wondering about what year it is. On the back it says Earth Sound research a product of I.S.C audio farmingdale Ny. 11735 It is an all tube amp with Four-6l6 tubes and One 12AT7 and THREE 7025 MULLARD Tubes. But I have no way of knowing if they are all original or not. This amp sounds great. But My other question is If I replace these tubes with other tubes will that change the tone? I am kinda new to tube amps and I am learning all I can. i attached some pics of what I call the BLUE MONSTER.
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