Warm-up time for amps and preamps

What are all you guys smoking? With SS equipment, it only takes a fractions of a second to reach stability, with tubes it might take a few seconds only! How can you prove that what you hear 45 minutes later from the same source and media sounds any different?

" How can you prove that what you hear 45 minutes later from the same source and media sounds any different?"

Why should anyone here have to prove something? If you don't feel its necessary to warm up your system, great. If others want to, that's they're business. Besides, its hard to find an owners manual that doesn't discuss warm up. What proof do you have that they're all wrong?

for the same reason that anyone here should have to exercise correct word choice - a question was asked and people are giving answers


as to how to test - you would want two copies of the same component - warm one up (w/o listening) for an hour or two and then A/B/X them

10-15 years ago had a sound engineer come to my home and plot frequency response with MLSSA software, using test tones and sound level matched by meter. Repeated 5-6 times over the next 3 hours with the differences clearly notable on the visual graphing. Nothing subjective about it so far. Did those differences translate into different sound? Yup. Did I perceive those differences as qualitatively desirable? Yup. This on an all SS system left on 24/7, unless I will be absent for 2+ weeks. Just for the fun of it we repeated this on my and a couple other systems a few times. Same result without respect to components-visually represented differences in response over time, some more so than others, but none stopped changing within our 3-4 hour window of trials.

Oops, premature send. I meant to end by saying that in many instances we continued to see visually represented change long after we believed we heard any additional changes.