Jack- Usually, old tubes become noisey and their sound can become dull and closed-in. However, I've had 12AX7 tubes that went thin and edgy as well as noisey. Tube rolling can be a great way to improve the sound of any system, and depending on the type and quantity of tubes needed, it might not be very expensive. You might want to check with someone like Kevin at Upscale Audio about tube recommendations and available/cost for your equipment. There are other dealers as well, but Kevin is very knowledgable, and usually very responsive. I'd have trouble recommending going to ARC for replacement tubes as they tend to be very expensive. Good luck.
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