Tube stereo sounds -smaller- after being on

Thanks everyone for your thoughts. I only thought about the line voltage being an issue when I wrote the above post. The amp came with a Chinese made voltage regulator that doesn’t seem to be adjustable and shows 217 volt output on the led screen. I always thought that was pretty weird. But since it came with the amp from China I didn’t question it. As for other possible issues, the mixer, being Australian made, could also be in some voltage netherworld. It comes with a separate power supply set up for the US which gets very hot. I can take that out of the loop easy enough and see if that’s the issue. Plus I probably should just buy a different regulator for the amp. 

The mixer is a great sounding one hand built in Australia called a Condesa Lucia.

Ok a couple of posts to unpack here. Pindec not to open a can of worms, but I’m more in the musical nirvana side of things as opposed to high fi nirvana. The system has a fault somewhere, so you’re right the equipment doesn’t need to be changed, I don’t think, as it does sound good sometimes, just the fault found. 
 

As for Mijostyn, this is exactly the style of thinking I run away from. This didactic belief that something like tone controls or no tone controls has any real meaning at all. So many times people post their vague notions instead of actual knowledge. I don’t really think that helps anyone. We all have bias’ but there’s no need to think our bias’ is a cogent fact. -  You know every record you listen to went through multiple sets of tone controls. 

Hey Mijostyn, everybody has their mindsets. Some people think the world is flat or the US never landed on the moon. I’ve been making records for the last 40 years, before cd and digital. I was around when cd’s were going to solve everything, and digital recordings were going to be more ‘accurate’ than analog. I’ve worked on all sorts of pieces of equipment. I’m not saying this because I think I’m an expert, far from it. I have so much more to learn. I’m just saying this as a background for the concept, that in a recording studio and mastering lab, analog eq’s are held in very high regard. And a lot of vintage equipment has great monetary value and is even replicated (to some extent) as plug ins because the qualities of that gear is treasured. So you know what you know, but I don’t think you should discount the idea, because you feel you know something, that it’s true. Not to sound like Donald Rumsfeld here. 😂

Hi DeKay, I've been in Mississippi last week, so have done nothing. Someone suggested the rectifier tube which is a good suggestion. I don't think I have a spare. My EMT turntable however, needs a power converter so I can take that out of the system and use that converter which is a high quality one and switch out the Chinese made one that came with my amp. I will do that and report back when I have the time. Thanks again everyone.