Tamdhu was a typical small scale, two still distilleries for the majority of its life up until expansion beckoned in the early seventies. Thankfully there are bottlings of Tamdhu from before this modern era that offer us a glimpse into its past. There are excellent aged Tamdhus from Duncan Taylor and Hart Brothers who bottled a series of exemplary late 1960s casks.

Tamdhu's modernisation program began in 1972 with the addition of a new pair of stills, another pair was added in 1975 bringing the number up to six. This transformed Tamdhu from a smaller, old-style distillery to a big, modern, blending orientated plant with modern equipment and intentions. The result on the spirit was that the distinctive waxy fruit elements of the 1960s make disappeared and in its place was a much sweeter, cereal driven and delicately fruity spirit.