Burning Burn in question

The current drawn from the dac/pre by your power amp will be well under 1/10,000th of an ampere, and most of the circuitry in the dac/pre has no involvement in supplying it. I doubt that having the power amp connected will have any influence on the burn-in effects that will occur. I agree, though, that it makes sense to have signals going into the dac/pre.

Best regards,
-- Al

Also, while it is probably very unlikely, I would not totally rule out the possibility that the long-term reliability of the input stages of the power amp could be degraded by exposing them to large amplitude signals for prolonged periods of time while in the powered down state.

-- Al