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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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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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The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts. Bertrand Russell 

11th November 2006, 06:25 PM  #7 
diyAudio Member

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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Join Date: Dec 2002
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Quote:
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The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts. Bertrand Russell 

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

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

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