yes, avoid tubes. why not get a multichannel power amplifier.
if you want a 5 channel one, get this one - Apollon Hypex NCOREx NCx500 Multichannel Amplifier (3-5 Channel) | Apollon Audio Hypex Purifi Premium Amplifiers
Also, the Sourcepoint 8 is not current demanding with minimum impedance being 8 ohm and the EPDR of 4.3 Ohms means they're not current hogging speakers. So, any competently designed speaker with good damping factor and moderate voltage swing should be fine. @chauncey