Again, not to be defensive here, but I thought of one other example of what I want to convey.
In 1986, a year out of grad school, working full time, single and with some discretionary income burning a hole in my pocket, I went shopping for my first really good stereo. This was metro NYC, before the Internet, when there were still lots of brick and mortar stereo stores in NYC and the 'burbs.
I schlepped a copy of James Taylor's "That's Why I'm Here" LP to every audition at every store. In those days, I was fixated on a bass guitar glissando that comes in around 5 measures into the song. If it sounded like a stringed instrument and captured the whole bass guitar sound, I was impressed (which was how I ended up with a pair of the original Vandersteen 2C's).
So, I've been listening to that album for about 30 years.
Anyway, about 7 measures after the bass guitar glissando, an electric piano comes in. And the first time I heard it on the Kit 1, I grinned because the piano floated in front of the speakers and swirled around the room, which had never happened before. That's the kind of experience I'm talking about.
Mapman: What's missing? Hmmm.... good question. Low end is surprisingly powerful, especially given the rep of 300B amps, but perhaps the grip of the Manley's was a little firmer? Hard to say. That's why I'd be so curious to hear this amp on a pair of more efficient speakers that didn't make it work so hard. Other than that, not much. I mean, shoot, I was listening to something else this morning, something very familiar, that gave me the chills, that's how musically captivating it sounded.