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regulated screen supply

Assume an output resistance of 5 Ohms of your complete tube regulator, this would means a time constant of 5x120us=600us. This means a corresponding frequency of about 300Hz! This means that the cap is working mostly in the domain above 300Hz and the regulator below 300 Hz. If I assume the cap to be a electrolytic one, not a very good idea! It is better to work with a small cap with a fast regulator with high internal feedback. The cap should work only in the domain above 40 kHz. A well done SS regulator should be fine. Noise isn't a problem, if the corner frequency is about 40kHz. Use a polypropylen and a ceramic cap in parallel.
This solution would be cheap and have to be considerd before using a lot of iron and huge caps.


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