If you have pre-amp outputs one of the solid state amps you can run that to another amp. At that point you only need a power amp, not another integrated.
The hard part is connecting to just one pair of speakers. If you accidentally run both amps at once you just might blow something up (probably the tube amp). Niles makes/made an amplifier selector to all for 2 amps and 1 pair of speakers.
The hard part is connecting to just one pair of speakers. If you accidentally run both amps at once you just might blow something up (probably the tube amp). Niles makes/made an amplifier selector to all for 2 amps and 1 pair of speakers.