I called the people at Jolida, and at Response Audio who performed the mods on my 501 amp. They BOTH felt that tube rolling is good, possiblly damping, but the other mods that people are selling change the essence of the machine to have a more solid state, snappy sound which is not what their intention was. The Jolida people had no problems with the mods done to the amp. If the 'Jolida tube sound' is what you want stay more stock. With that in mind, I am getting a stock unit. P.S. Response Audio was great-usual disclaimer, no connection to them.
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