In the OPs case that may put the FET dissipation well above 20W, which is not easy to do with a single FET package, especially as the current waveform in that position has a high peak ratio.
Unless you go from an existing design and its parts/construction, and stick to within its operating limits, then you effectively have to take the design role on yourself. Initially that starts with setting your operating limits, parts selection/availability, and how you are going to construct the device and dissipate the heat. That may not be trivial for you?
shaving off voltage is easier and a better situation than having voltages fall short of the requirements......
with tubes, the easiest way is with resistors, say you have all tubes warmed up and biased with desired currents, then knowing how much you need to lose is easy to determine and the resistor that can do it as well.....
i'd say a resistor at the secondary of the power traffo and at the B+ line gives you total control of the operating voltages you desire.....i do this all the time on my builds...
with tubes, the easiest way is with resistors, say you have all tubes warmed up and biased with desired currents, then knowing how much you need to lose is easy to determine and the resistor that can do it as well.....
i'd say a resistor at the secondary of the power traffo and at the B+ line gives you total control of the operating voltages you desire.....i do this all the time on my builds...
Thanks for the reply. I realize it can be done and has been done for years with resistors. I just wanted a different approach to it.
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