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(red-ct-red) For full wave rectifier, do we enter the measured full (red-red) Secondary winding's DC resistance into the Secondary winding resistance field of the Calculator? Or, do we enter only half (red-ct) of the full winding's DC resistance value? If the later, should we take the measured red-red ohm value and divide by 2 since the two red-CT values are never identical? (The off-load voltage of the two halves of the winding are never identical as well so I assume we use the full red-red voltage value divided by two.) Thank you! and thank you for PSUD2!!!

Hello Thanks to group members answering my previous Q - adding sections and solved by tapping on a Mac trackpad (!) Yep, I had no idea. However, and having reviewed the available documentation on PSUD2, that I can find, anyway, I'm still in a quandary about what to 'look out for' and how to actually i.e. practically go about designing a 'good' 'good enough' PSU? For instance, although it's a simple task for me to measure primary and secondary winding resistances, I do not know the % regulation of my Trafo. Nor do I understand the application or function of 'current taps.' Is my 'final' load - 5kΩ or 86.5mA (the combined load of a 300B and a 6N8S / 6H8C? To me all these things are still mysteries. https://www.dhtrob.com/overige/pdf/dhtrob_psu.pdf has helped me, a little, thanks DHTROB, but maybe I''m just not 'clever enough' or cut out for this kind of thing and perhaps there may be other people in similar difficulty?

I had to change computers and need to download a new copy of the PSU software. I am having trouble figuring out how to find it now. could someone please help me with this? THank you, Jay

i tried to downloaded psu sofware but it dont works ,can you help me thanks

Tube rectifiers often specify the minimum resistance required in series with each rectifier to limit peak current. For full-wave rectification, does the source resistance shown in PSUD refer to the whole secondary winding or, as with the voltage, half of it?

Hello! I am getting this error when trying to download the official windows executable from http://duncanamps.com/psud2/psud2_setup.exe Anyone seen this one before? Thanks! Forbidden You don't have permission to access this resource. Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

Hello Thanks to the help received from people (as an ex chemist I have some experience but zero training in electronics) I have been able to resolve a number of very basic MacBook-related PSUD2 issues - the double tap on the track pad still initiates annoyance though and hopefully there may be a way to remove the need in PSUD3? As to PSU design... it's now a relatively easy task for me to "lay out a design" with nanovolts of variation at say 10 seconds after 9 second reporting delay ~ but in truth I find I have scant real innerstanding of what that really means. Moreover those nanovolts are achieved with what I assume are huge amounts of inductance (20/40H) and large, expensive and normally non-stocked link capacitors of the sort that, if they are available, necessitate buying boxes of them from the US of A. However, when I try to model published PSU designs (e.g. Jac van de Walle/JAC Music, Menno van der Veen, Claus Byrith etc) not only do they achieve their results using, in comparison to my efforts, fewer, simpler arrangements in effect more elegant, "rational" and "economical." If that were not enough I would appreciate a steer on whether incorporating Llundahl - type double winding chokes ~ is anything "mystical." Yep there is much to learn. Thanks for the forum's continued understanding and guidance. Is a rational guide possible if not AI optimisation?!

Hi, Downloaded the Windows version from the Files page but all I seem to be able to access is the Help area. What am I doing wrong? Thanks, James.

Hello John, The damnedest thing ~ I tried it again and EUREKA ~ PSUD2 does indeed insert filters on a MacBook. I had no idea of the existence of that pop-up. My MacBook was bought 'refurbished' and I have some issues with it (e.g. Maps are blank every other day) so perhaps it's a case of a worker blaming her tools... I've only been using Macs since the early 1990s (and amateur programming, in Fortran and Basic, long before that ~ never something called machine code or ugghh MS DOS though ~ so I was certainly not up to speed with two-fingered tapping and I believe I'm correct in asserting that there is nothing in the (IMHO rather sparse) PSUD2 'documentation' about having to do the two-fingered shuffle to insert filters - on any operating system.) For that previously missing piece of information I have to thank you very much. I can now play the theoretical game 'do not blow up the rectifier' to my heart's content. However, this has thrown up another nasty for this naive Mac user... .PSU files ~ I can save them but cannot view them. Acrobat Reader immediately throws in the towel (corrupt attachment / not supported type blah;) whilst I could use screenshot to save them it's yet another mystery. Finally, when I do the calculations for the HEXFREDs I propose to use, I might be in position to start building an amplifier. I've only been collecting expensive parts for a decade or more. Once again, John, please allow me to say that your advice has been priceless. Siobhan Sent with ProtonMail secure email.