Hello Daniel. Regarding your inquiry about excellent solid state amplifiers that might rival your tube setup, give CODA Technologies a try. I bought a new old stock (NOS) 10.5r solid state amplifier earlier this year. I'm definitely impressed with the build quality; the sound is fantastic and the customer service is stellar. They're not inexpensive but I'm confident you can find a model to fit your exact needs.
http://www.coda-continuum.com/
Steve
