THE MULLARD ONE ARM BANDIT FROM DECEMBER 1950

Many users found the depression of the RHS handle to operate the Mullard High Speed Valve Tester  quite wearing -  and this at a time before  repetetive strain injuries were invented - stiff upper lip, grin and bear it!    The boffins at Salfords listened and voila, the tester was modified to have a one arm bandit style operating arm, not only that, if you pulled it and your valve tested for good emission, three cherries in a line appeared on the CRT.......................................  sorry couldn't resist that one.

Mullard advertised the change as ergonomics with  an added security measure, to stop customers from interfering with the valve tester, the knob and arm could be unscrewed to prevent meddlesome usage by  shifty spiv types and young schoolboys with caps, short trousers and sticky fingers.