Which Krell to hunt down on the used market?

KSA-250,might need a tune up,maybe not.

I haven't owned many Krell units in my time but I think the last of the best ends with the KAV-XXX yr2001-2 or so. The AVS was the most absolute definition of quality in AV sector. The HTS-1 &2 are also more wanted IMO. The amps and sources are in the same boat and time frame.

Also, I think astetics play a factor in what appears to be a quality unit. With companies trying to cut costs, increase efficiency and increase profits, it may be obvious to some that they have changed and I personally think that change started with current line up of light silver KAV-xxx.

Now the Class a stuff is still top notch and always will be, but how many consumers are willing to get that quality with a set-up costing 80K+. The quality will always be there with them.

No comment on the reference line.

Sound like you got some bad information. Krell has never made anything as musical as the newer FPB series. I have owned two of the FPB amps, the better one being the FPB 700cx, and I have spent untold hours listening to some of the older KSA/KMA series. The newer ones are far more neutral.