I'm driving 86 or 87 dB sensitivity ProAc speakers with the CJ CAV50 integrated tube in triode mode (22wpc): no problems at all in a medium sized room. I'm in SF and Nycjdc's welcome to come over and listen. Two integrated tube amps currently in production and available used for under 2K are the Rogue Tempest II and the VTL IT-85; I think they're both 60 wpc rms or more, and well spoken of.