Great description David. The only thing I might add is that Sound Valves produced the Dyna 70 when it made it's comeback a few years ago (short lived).
The current Sound Valves (brand) are almost the same amp and was originally very reasonably priced. There were both mono and stereo versions, and available as a kit or fully factory assembled. I bought two of the factory assembled Stereo 70 versions for my surround system about six years ago and have had zero problems.
The current Sound Valves (brand) are almost the same amp and was originally very reasonably priced. There were both mono and stereo versions, and available as a kit or fully factory assembled. I bought two of the factory assembled Stereo 70 versions for my surround system about six years ago and have had zero problems.