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Tube testing not enough?

I always recommend keeping a back up set of tubes on hand.

Not just for replacement in the event of failure, but to pop in after every six months or so.

I've found that a tube can still measure OK, thus meeting the manufacturer's estimate of longevity. But there is a difference between working OK and sounding more alive and cleaner.

If a new, unbroken-in tube bests a used, but functioning tube, for me it's time to throw away the old one - or put it aside as a back-up in case of a catastrophic failure. This subtle degradation always seems to occur well before the manufacturer's stated tube life ends.

IMO & IME, of course.

Best regards,

Jim Smith


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