Preamp tubes do not push speakers and move air, and can last even longer.

That said, all tubes can be mechanically damaged from being bounced around in transit, or exhibit manufacturing sample defects. Preamp tubes can develop static or microphonics (ringing). Power tubes can develop internal shorts and glow red or blow fuses.

At Dr. Rock, we will only replace defective tubes because you won't hear any difference if we replace a good working tube with a new one. We don't carry cheap tubes, either. We only sell the best tubes available, selected for low noise, matched for output and backed by Ruby Tube's full 6 month warranty when installed by us.

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