Four Hour Tube Amp Warm-Up

Pretty much in agreement with the above, this with many tube, both push pull and SET over many years. I notice as the amps age magic time can lessen to around two hour mark, also depends how hard I run them, running them hard further lessens time. I do always give at least hour lower volume prior to kicking things up. I also use boutique caps over much of my system, the physically huge caps I run in speaker crossovers need the hard running time.

I'll try to be more precise in my warm up time for this post. Much of the warm up time has to do with amp, tube and parts replacement. New tube components, or new tubes or parts in well burned in tube equipment never bloom in initial phases or hours of burn in. Over time, at somewhere between 50 and 100 hours blooming will often take more warm up time, this may be as much as 4 hours, as burn in progresses warm up time decreases until a consistent warm up time of aprox 1 hour at full burn in.

My 300b monoblocks are undergoing this  repeated progression at this very moment, recently replaced all coupling caps with Duelund Cast, getting up into 60 hour range and blooming is coming in starting around 3 hours and progressing from there. Between changing out tube components, parts and tubes for nearly thirty years now this is entirely common occurrence.

My experience with warm up time has been so variable over thirty years, variability in comments not surprising to me. I've found system presentation or voicing, tube types and qualities, especially power tubes in amps, standby ability, number of tubes in entire system, AC quality, cabling, on and on ad nauseam, all have bearing of when system kicks in, even mood plays role. I just wonder if there is some point of stabilization applicable to every single little thing in our systems, and ourselves for that matter?

With -20 degree wind chill factors during recent listening session even thought about how temp could be affecting AC cabling exposed to these temps, specifically, could temp of wire affect sound quality? Obviously heat is of concern here, does more heat mean quicker warm up times, cold or cooler longer times? This meant in relation to all parts within components.

I only know every listening session has a point where things just kick in, assuming nothing breaking in. I only find consistency when my system is in static mode, meaning nothing changed over certain length of time.