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Old 10th November 2006, 10:08 PM   #1
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Default 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!
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Old 10th November 2006, 10:15 PM   #2
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http://duncanamps.com/psud2/index.html
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Old 10th November 2006, 11:03 PM   #3
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Wow!

Thanks, Leadbelly.
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Old 11th November 2006, 12:25 AM   #4
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Here's a good reference:http://www.hammondmfg.com/pdf/5c007.pdf
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Old 11th November 2006, 06:43 AM   #5
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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.

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Old 11th November 2006, 05:12 PM   #6
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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.
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Old 11th November 2006, 06:25 PM   #7
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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
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Old 12th November 2006, 06:16 AM   #8
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Quote:
Originally posted by leadbelly


This is the Tube forum.
Ouch, sorry

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

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Old 12th November 2006, 06:29 PM   #9
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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.
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Old 12th November 2006, 06:36 PM   #10
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of course, only tube rectifiers are usable in tube amps...
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