PSU dimensioning for pre-amp
I have decided to give the 12AU7 based pre-amp described at the following (excellent) page a try:
DIY 12AU7 Tube preamp
However, regarding the B+ supply, what current drawn should I expect. My naive calculation would be to sum all load point currents up (2*6 + 2*11 = 34mA), and add a margin (say 20%). Would that do it? How would a more correct calculation be done?
(I'm planning to use a MOSFET based power supply and a homemade transformer taking 230VAC, outputting 230VAC + 6.3VAC. Since I like slimmed designs I don't want to use an overkill sized transformer, thus my question.)
Best regards, Robin Lilja
Your calculation seems OK.
OK, thanks! :)
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