A 1958 Tremolux just appeared for sale in Australia which is pretty rare for these parts. The advertisement lists it as a 5E9 but based on the year (assuming this is correct) I think it should be a 5E9-A. Anyway I would dearly love to get a Tremolux, but especially the 5G9. How different is the 5E9-A from the 5G9? The original transformer has been replaced with a 'ToneClone Pro from Mercury'. Any reason to be concerned by that?