This trader advert from June 1950 continues the Ultra Twins, already a successful formula in portable radio sales.

The New Ultra 'Twin 50' means business

New look.  New battery saving. New 20-second mains/battery changeover!

The new ULTRA 'TWIN 50' will sell even faster than the famous Ultra 'TWIN' because of its new look, new battery saving due to separate HT and LT batteries.  Greater accessibility now gives a 20-second changeover from mains to battery or vice versa.  The detector-valve and ganged tuning condenser have been specially cushioned to eliminate microphony.  With all these outstanding advantages the ' TWIN 50' is the set your customers will want.  So this is the moment for you to display the 'TWIN 50'.

... put it where people will see it!