I have a few amps in the collection now. Some I won't get to try till next summer though. Radford Sta 25 is my favorite so far but also have Pioneer M22 , Quad 2 system and the Bedini. Trying other speakers too. Tannoy gold 12's and Spendor S3/5se I have not seen yet. Do I need more power for the Spendor's?