If the cj preamp is tube based, they do indeed take awhile to reach full potential.
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It takes 2-4 hours for my high-end SS amp and high-end valve CD / DAC system to warm up to hit its peak performance capabilities. It is a very common practice, especially with tubes.
But it does not involve playing it loud, or even playing it all during this start-up ""warm-up" logistics exercise. Rather just letting it all calmly warm up slowly on its own and actually leaving it alone suffices.
I'm puzzled by the OP's gear requirement to crank it up as his required modus operandi.
In your tube component especially, warmup is essential to prime listening. The nodes must be burning for a while before the electrons fly across those gaps in a smooth unwavering flow. Keeping the component on all the time can keep your electric meter spinning as it can generate much heat, depending upon the tube type. But you wouldn't have to remember ahead of time to turn it on.
I have the same question as parabolic.
The only things I keep powered up are my SS phono-pres.
On some sessions I think I hear an improvement after 20 minutes, on some I notice no change. The ones where I do notice a change are usually playing LPs vs digital sources. And usually with a DL-301 vs a Shure V15.
Everything needs a warm up: Speaker surrounds, phono cartridges, amps, preamps. Every dang thing! Enter your text ...
The warm-up time of speakers (apart from the run-in time) is rarely mentioned, so nice to see it noticed here. I would say it’s equally important, perhaps even more so than warning up electronics. Prior to any serious listening session (and when the surroundings permit) I often start by turning up the volume significantly beyond my typical reference volume level with some "highly energized" music, and then leave the room for a while to let it "settle in" (half an hour is more than enough). This little treatment can be done, and is necessary I find from the very get-go of turning on the stereo or later on in the process to really have the sound "snap in" and become slightly more present/fuller and alive. Maintaining the lower reference volume level from the beginning seems not to do the same over time, so it’s not really about speeding up a warm-up process rather than having the speakers cross a threshold of sorts with higher levels, that frees the sound increments further. I’ve noticed the same effect with different speakers, so I would assume it to have general importance.
Warm-up is definitely a phenomenon...and I can hear the transition. It's not distinct like going from dark to daylight but it's as much a revelation once you're in-tune to it. Speakers are affected as well. I give up my system for Lent. When I power up Easter morning, I am dejected because it sounds like a big waste of money. I have to remember it's like having a knee-cast removed after 6wks. Everything's stiff as hell. But after a couple days, it's back in the groove and so am I.
I'm definitely on board the "warm it up" boat. It's strange how the sound becomes more present and liquid once everything is warmed up. Using good old fashioned class AB amplification, it takes some actual listening to get things really warmed up, which thankfully won't be the case when I finish the class A amp. Even leaving the old unit on for a few days makes a difference that's hard to quantify.