Anyway I prefer tubes than solid state If I have a choice.The owner of this KLH where I bought them. He is using Marantz tube amp .
KLH model nine full range speakers
Right now Iam using Plinius sa 100 amp. Iam happy with the sound and musicality. I just happen to read that Art audio concerto mark 2 can use KT 90 and KT 120 .I own this amp 40 watt per channel. Iam using 6550 tube the power it’s a bit short .. My two options to get KT 90 or 120. Or audition anticable autoformer to increase the power to 60 watts. Any comments thanks.