Is designed a PSU with 290v-0v-290v transformer (Imax = 100mA, 58VA, Rpri=21ohms, Rsec=238ohms) and a 57mA total load. I want to have arround 350Vdc at my B+ (with silicone diode rectifier, and only 2 RC network after the B+)
I have doubts since I saw some many schematics with annotated values that let me understand that the transformer voltage might be to big. And since I am about to order it, i need some help :). I have tried the PSUD 2 method design which gives me 346Vrms
I have tried the Merlin Blencowe way with very close results http://www.valvewizard.co.uk/psu.html I found the following results Rl = 290*sqrt2/0.057 = 7195 Rs=243.2 Rs/Rl=0.0338 f * C * Rl = 50 * 47?F * 7195 = 16.9 ==> Green Curve 120% of transformer RMS Voltage ==> 1.2 * 290 = 348Vdc. Many people on told me that i should get values more close to 380VDC, far to high for a 5W amp... My conclusion is they use rule of thumb by multiplying by x1.3 the RMS transformer output which should be right with a more powerfull PT arround 200mA, but in the same time, it looks their explainations are based on personal experiences.
So how much reliable is PSUD in my context and should I consider to buy a lower voltage power transformer (10 volt less for exemple) to get 350VDC?
