Garnet Gnome

AngrySailor

Veteran and General Yakker
Joined
Oct 15, 2014
Messages
3,097
Tagline
---not quite right
#30
Was looking at those transformers today, not sure 350/0/350 is correct? I’m getting ~290vac from the good winding no load/diodes lifted. Won’t 350/350 be too spicy? The filament winding is 6.3vac and good. The schematic specifies 515vdc after the diodes...
 

BlueCrab

Journeyman
Joined
Nov 10, 2019
Messages
228
#31
So the schematic that was posted shows 515vdc at point A. If this is correct, then the transformer would be 515*0.707 = 364 vac (assuming no load). I think the 350/0/350 would be just fine as tubes will work over a wide spread. However that first cap is shown with a working voltage of just 350vdc - way too low if indeed the voltage after the diodes was/is 515vdc. That cap's working voltage is too low if the transformer puts out 290vac, which would give about 410vdc across that cap.
 

AngrySailor

Veteran and General Yakker
Joined
Oct 15, 2014
Messages
3,097
Tagline
---not quite right
#32
So the schematic that was posted shows 515vdc at point A. If this is correct, then the transformer would be 515*0.707 = 364 vac (assuming no load). I think the 350/0/350 would be just fine as tubes will work over a wide spread. However that first cap is shown with a working voltage of just 350vdc - way too low if indeed the voltage after the diodes was/is 515vdc. That cap's working voltage is too low if the transformer puts out 290vac, which would give about 410vdc across that cap.
290 no load, my field of knowledge is more based toward mechanical engineering, I knew there must be math to fix this
 
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