Nanda had floated three companies including Dynatron and Crown. Hull created an oscillator, the dynatron oscillator. The dynode takes its name from the dynatron. In the dynatron a tetrode tube is used. By 1945 the use of the dynatron circuit was declining. The tetrode wasn't the only tube which could generate dynatron oscillations. The rights to the Dynatron name are currently held by Roberts Radio. In 1981, Philips sold Dynatron to Roberts Radio. He ran Dynatron Services, an engineering firm before entering into the hospitality sector. In 1981, Roberts Radio bought Dynatron from Philips. During this time, Dynatron was moved from Maidenhead to King's Lynn.