Don’t know about the 15 but have had a CA200 for close to 25 years. Always worked well with tubes - CJ premier 14 and ET5. 75 ohm input impedance so it is an easy load for most tube preamps.
Also drove Thiels with the CA200 - it is a beast at only 200 watts.
Jerry
Also drove Thiels with the CA200 - it is a beast at only 200 watts.
Jerry