Oh..... dimmers. Although some manufacturers supposedly make noise free dimmers, the way to do it is with variacs, which is only practical (due to their larger size) with new (re)construction. If you do a seach on Ebay (variable transformer,variac) you'll usually find a goodly number of NOS small (depending on your va needs) variacs and very low prices. Your 'sparky' would be overjoyed.