secondary. Calculating the primary Knowing the load for the output valve, the number of secondary turns, and the voice coil impedance, it is easy to calcu- late the primary turns required. The load impedance may be printed on the trans- former or can be checked on a valve characteristic chart. Loads for some of the most frequently used valves are For example, the largest of these will have a nameplate rating of around 1,800 W power line input and a HV transformer secondary of 2,500 VAC. While there are some losses in the HV transformer, and some power is used by the magnetron filament, controller, motors, and light, this still leaves, perhaps, 1,600 W into the HV generator. The model is called a Transformer and it makes use of several methods and mechanisms that I'll introduce here. The papers I refer to in the post offer a more detailed and The paper 'Attention Is All You Need' describes transformers and what is called a sequence-to-sequence architecture.