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PSU dimensioning for pre-amp
PSU dimensioning for pre-amp
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Old 17th February 2013, 01:23 PM   #1
rblilja is offline rblilja  Sweden
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Join Date: Apr 2012
Location: Sweden, Sthlm
Default 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
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Old 17th February 2013, 01:44 PM   #2
DF96 is offline DF96  England
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Join Date: May 2007
Your calculation seems OK.
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Old 22nd February 2013, 09:46 PM   #3
rblilja is offline rblilja  Sweden
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Join Date: Apr 2012
Location: Sweden, Sthlm
OK, thanks!
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