What tube amps for the Quad ELS 63

To come back again to this old thread:
Curio, I agree with you. The JA 30s are sublime. However they won't quite be able to tickle out the (already somewhat limited dynamics)of the 63s in comparison to what the JA80 were capable of, if tubed right-vide Greg's post above.
Cheers,
D

Music Reference RM10 MKII.

The speaker needs an amplifier that can do a good job of making constant power with respect to its impedance. The reason for this is that the impedance curve is based on a capacitance, and so is decreasing as frequency increases. At the same time the impedance is quite high in the bass region, and many amplifiers will have difficulty making power at these frequencies as a result.

So. much like the 57, but with greater power handling ability, the speaker has always been a good combination with OTLs, going back to its initial introduction. OTLs are one of the few amplifiers that can make power in the bass region of the speaker, without sacrificing the highs. Its been my experience that the speaker can manage 100 watts alright, and it seemed a lot more fun with the extra power.

Quad II's or Quicksilvers.

I used a Cayin 50 with great results in a smaller room. When the 63's went to the living room I used the Quad 909/99 with excellent results. I absolutely agree with an earlier post that the 63's should not be toe'd in...keep them square to the room. If you need to adjust soundfield play with distance between the speakers and the distance from the walls. They aren't too finicky but when they are set up right and played at the right volume they are great!