Formula for calculating HT voltage?
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 10th November 2006, 10:08 PM #1 diyAudio Member     Join Date: Jan 2006 Location: Upstate New York Formula for calculating HT voltage? I can't seem to find this one elsewhere for some reason. I know it's pretty basic stuff, but hey.. Basically, I want to learn the relationship between the AC from the transformer, the associated rectifier and the voltage that is produced. Any good links? BTW - I have left my "Valve Amplifiers" book somewhere between Connecticut and Pittsburg, so I won't have that as a reference until I order a new one. Thanks!
 10th November 2006, 10:15 PM #2 diyAudio Member     Join Date: Dec 2002 Location: Calgary, Alberta __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari
 10th November 2006, 11:03 PM #3 diyAudio Member     Join Date: Jan 2006 Location: Upstate New York Wow! Thanks, Leadbelly.
 11th November 2006, 12:25 AM #4 diyAudio Member     Join Date: Jun 2002 Location: Macedon NY Here's a good reference:http://www.hammondmfg.com/pdf/5c007.pdf
 11th November 2006, 06:43 AM #5 diyAudio Member     Join Date: Dec 2005 Location: Italy With no load the formula is very easy VDC = VAC * sqrt(2) example 15Vac = 21.2 Vdc (after rectifier & caps) But in reality it needs to keep in mind the loss of tension on the rectifier and on inside resistance. bye __________________ My English originates from here
diyAudio Member

Join Date: Dec 2002
Location: Calgary, Alberta
Quote:
 Originally posted by Gold_xyz With no load the formula is very easy VDC = VAC * sqrt(2) example 15Vac = 21.2 Vdc (after rectifier & caps)
This is the Tube forum.
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari

 11th November 2006, 06:25 PM #7 diyAudio Member   Join Date: Jan 2002 Location: Tyrone Ga. U.S.A. But you need to take into acount the voltage drop across the diodes. Case in point I needed a 6.3vdc supply and had a spare 5v winding well 5v x 1.41= 7.05v which seems too high for my tubes but when built it prodused 6.12 v because ~1v lost across the diode. Woody
diyAudio Member

Join Date: Dec 2005
Location: Italy
Quote:
 Originally posted by leadbelly This is the Tube forum.
Ouch, sorry

I meant : Example 510Vac * sqrt(2) = 721Vdc

bye
__________________
My English originates from here

diyAudio Member

Join Date: Dec 2002
Location: Calgary, Alberta
Quote:
 Originally posted by Gold_xyz Ouch, sorry I meant : Example 510Vac * sqrt(2) = 721Vdc bye
No, that's still not my point, that formula is useless when talking about tube rectifiers, even no load.
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari

 12th November 2006, 06:36 PM #10 diyAudio Member     Join Date: May 2006 of course, only tube rectifiers are usable in tube amps...

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