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At age 22 he formed Sinclair Radionics, his first company, making mail-order radio kits, including the smallest transistor radio in the world.

Aged 22, he formed Sinclair Radionics, his first company, making mail-order radio kits, including the smallest transistor radio in the world.

But while his books sold well, Sinclair was anxious to get back to inventing, and formed his own company, Sinclair Radionics, in 1961.

Developed by Britain's Sinclair Radionics, the 26� oz., minitube measures 6 in. by 4 in. by 1� in., which calls for an ample pocket.

Commercial success for the minitube is also a life-or-death issue for Britain's Sinclair Radionics, which has shown itself adept at technology but unlucky at marketing.