Your investment in your entire system is compromised, I can see why you would want to solve this.
I have been lucky over the years, much tube gear, Fisher Mono Blocks, Fisher 500C, Fisher 800C, Scott, Tandberg, .... They all sounded great right away, no warm up.
I also had big McIntosh SS MC2250, it was good from turn on. Via it's SS C28 preamp, started good right away.
My current Tube Amp, Cayin A88T, supposedly designed to sound like a McIntosh MC275, definitely needs 20 minute idle warm up, every time.
1st time experiencing this, took some getting used to, I turn it on, idle, do other stuff, come back and listen. It's integrated, so I use it without my tube preamp for Reel to Reel, ..., and use it's pre-in for Phono and FM via my tube preamp.
Needing long active warm up, leaving it on a long time, would be unacceptable to me, I would definitely sell that amp and get one that was ready to go after a short, 20 min idle warm up.
I have been lucky over the years, much tube gear, Fisher Mono Blocks, Fisher 500C, Fisher 800C, Scott, Tandberg, .... They all sounded great right away, no warm up.
I also had big McIntosh SS MC2250, it was good from turn on. Via it's SS C28 preamp, started good right away.
My current Tube Amp, Cayin A88T, supposedly designed to sound like a McIntosh MC275, definitely needs 20 minute idle warm up, every time.
1st time experiencing this, took some getting used to, I turn it on, idle, do other stuff, come back and listen. It's integrated, so I use it without my tube preamp for Reel to Reel, ..., and use it's pre-in for Phono and FM via my tube preamp.
Needing long active warm up, leaving it on a long time, would be unacceptable to me, I would definitely sell that amp and get one that was ready to go after a short, 20 min idle warm up.