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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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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 
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 
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
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My English originates from here 
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  
diyAudio Member

Quote:
__________________
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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