2a3 SET amplifiers will usally give you 4 to 5 watts/channel. A 45 SET is in the2 watt range. Still you`re asking too much of your amp to drive this speaker. You should consider speakers with at least 97db minimum and thats assuming the amp has quaility transfomers and a stout power supply. How large is the room, music type and listenig volume?
