Almarg
But as might be expected given that its design pre-dates the introduction of solid state amps, it is considered to be a tube friendly speaker, and tubes are my preference when it comes to power amplification.
yeah, the design predates moi, by a few years as well.
My actual pair of 57's are only about 6 years old. Fresh Wayne Picquet rebuilds. I am using an amp that was specifically designed for them. Music Reference RM10. Its been my personal experience that one needs to be very careful with their choice of music with them. My wife for example, seems to get suspicious, and keeps visiting me down in my space whenever female vocals are playing.