There are 3 transformers with rectifier each , separete transformer for filament voltage,
separete transformer and rectifieres for grids voltage (may be next PA will with tetrode),
sofr start in it. Importand! There are all transformers on a plate from polyamide or other
isolator. The output HV has three values: 1,1 kV, 2.2 kV and 3.3 kV.