hi tech gurus , I am working on a project of making a valve amp for guitar.In order to get the desired volts of around 350v for the valves i have used two different transformers the primary of the first transformer is connected to 240vac and the secondary winding of 12vac is connected to the secondary winding of the other transformer and so i get a output of around 350v dc after rectifying and filtering.The amp works great but the first transformer literally gets to boiling point ...very hot , which is no good.any help would be greatly appreciated ..Ta