THE GREAT MULLARD MAGIC BLOG — battery valves

Even though the National Grid came on stream in 1947, the public electricity supply in the UK was a real hotch - potch of AC/DC offered at differing voltages - indeed my own parents came cropper of this in their flat at Arnold Place, Whetley Hill,  Bradford as one plug was DC yet another AC resulting in a prized radio going BANG - what a mess!   Little wonder then that 20% of all radios fittted with Mullard valves in the early half of the 1950s were fitted with battery valves.   The Mullard battery valve series comprised of five types...