I owned Model 6's and I am not aware of any updates available for the amps, but perhaps there are? Rowland for a time offered, for the Models 8 and 9, conversion of the battery power supplies into switching power supplies. In addition, base Models 8 and 9 could be upgraded to "ti" status. However, I am not aware of any such upgrades for the Model 6's. To what do you refer?
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