Single ended = large images?

One amplifier I know I loved was a vac Renaissance 30/30. Push pull 300B output tubes. It doesn't have enough power for my current speakers, but I've heard about 300B SET amps. I have to wonder how amazing they must sound. I'm going to research these a bit. Maybe they are all low powered. I have thought about a vac Renaissance 70/70 or 140/140, but the cost of 300b tubes these days is pretty daunting. The 30/30 and a shindo montrachet are probably the greatest amplifiers I've ever owned, from a goosebumps musical point of view. 

@montaldo its worth checking what you have inside first. There was a batch of guys who saw my first post about 4-5 years ago and tried them in the M120s and the V4 amps. Cannot say I recommend it unless you have a lot of patience getting through the ridiculous settle-in time on the caps I have. Check yours first to be sure.

Mine are in fact the Supreme Eco SilverGold Black SESG Series Metalized Silver Gold Polypropylene Axial, SKU: Mundorf-80510, MSRP $59.88 USD each

The REASON I went to these caps in my QS amps is I wanted to confirm how much of the sound that I was hearing from my prior upgraded Cary amps was dictated by the sound of the coupling caps alone. Sure enough, caps matter a lot. 

The downside was just how freaking long it took for these particular caps to form and settle in. Good grief.   I was pre-warned by a retired local tech friend about this on the first set of Cary amps. He was spot on.  Told me to "get ready for the roller coaster ride", and yes it was nerve-wracking at times  Both Cary and QS amps took 300hrs before things stabilized and the sound and presentation stopped changing.

4 ft violin, 12 ft wide piano etc.

I’ve always thought that with most recordings with a piano in them, the piano usually sounds nearly as long as the small room I am set up in . . . but it’s been so long since I’ve been to live music (with or without piano). . . .

Not that this applies to you and your equipment, but I remember back in the early summer of ’01 when I got my present amp (Cary V12) I was set up in a bigger room and I was frequently operating within ear-bleed parameters. I remember one early afternoon when I was the only one in the house and I had the Steve Earle/I Feel Alright CD on, and I just kept tweaking it louder and louder and louder . . . I remember describing it to a friend of mine at work, I told him it was like the picture was blowing up bigger and bigger like a balloon! I thought that the speakers might explode! Anyway, I found the experience to be a lot of good clean sonic fun, and I rather enjoyed it.

Hmmm.  You only want to spend $7K on a new amp, but you have $$$$$ worth of REL subs in your system.  What am I missing?

Check into Audio Mirror SET 45w  monoblocks. You can get ‘em used. Two 6C33C wired in parallel in each mono bloc. Vlad is great to work with. These may be what you are looking for.