I don't think I understand. The amp won't work well with the tube? The Citation II is a tube amp, presumably designed to work with the tubes that are intended for use.
Do you mean the Citation II won't work well with your speakers? Or that the preamp you have won't work well with the Citation II?
Do you mean the Citation II won't work well with your speakers? Or that the preamp you have won't work well with the Citation II?