My recommenations would be:
First Watt SIT,
Pass .8 series,
Coda
You're never going to get the 300B warmth you're looking for via SS. If it existed, it would be the most popular amp on the planet. Another option would be a LIO DHT pre- coupled to wide bandwidth ss amp. That's probably my next step. I've owned Shindo Cortese, Berning 300B Siegfried (selling that was the absolute biggest mistake of my audiophile path), Berning ZH270, Kronzilla, Triode Labs 2a3, First Watt J2, and a bunch that I haven't mentioned.
First Watt SIT,
Pass .8 series,
Coda
You're never going to get the 300B warmth you're looking for via SS. If it existed, it would be the most popular amp on the planet. Another option would be a LIO DHT pre- coupled to wide bandwidth ss amp. That's probably my next step. I've owned Shindo Cortese, Berning 300B Siegfried (selling that was the absolute biggest mistake of my audiophile path), Berning ZH270, Kronzilla, Triode Labs 2a3, First Watt J2, and a bunch that I haven't mentioned.