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! :)