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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 
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10th November 2006, 11:03 PM  #3 
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Join Date: Jan 2006
Location: Upstate New York

Wow!
Thanks, Leadbelly. 
11th November 2006, 12:25 AM  #4 
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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 
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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
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11th November 2006, 05:12 PM  #6  
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Quote:
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There are still unbridgeable divisions between cultures. How can two peoples ever come to understand each other when one of them is ignorant of Totò? Umberto Eco 

11th November 2006, 06:25 PM  #7 
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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 
12th November 2006, 06:29 PM  #9  
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Quote:
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There are still unbridgeable divisions between cultures. How can two peoples ever come to understand each other when one of them is ignorant of Totò? Umberto Eco 

12th November 2006, 06:36 PM  #10 
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Join Date: May 2006
Location: Berlin

of course, only tube rectifiers are usable in tube amps...

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