You may want to replace tube 7. You're lucky to know which one it is. I'd get a new set plus one extra tube that matches. Antique Electronic Supply in AZ can probably match the numbers you have now. 480-820-5411 also check your fuses and find out if any are blown. Do the tubes bias individually or all at once? I'd also call Audio Research to make sure the bias is set to their specs. Hang in there, it will be worth the effort for tube sound. Good luck.
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