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Old 3rd July 2016, 02:46 PM   #1
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Default PSUD II question

I have an Antek power transformer that has two possible end taps. One has an off load voltage of 326 the other 345. There is no center tap. According to PSUD;

For full wave rectifiers, use the voltage for one side only. For example, if the transformer off load voltage is 350-0-350V (700V end to end), the correct value to enter is 350.

I want to use a 6X4 full wave rectifier. So do I enter 345 or 172.5 when entering the off load voltage?
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Old 3rd July 2016, 03:11 PM   #2
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You need to select Bridge rectifier.
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Old 3rd July 2016, 03:23 PM   #3
Ketje is offline Ketje  Belgium
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If there is no centre tap, where do you get the 172.5V ?
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Old 3rd July 2016, 03:27 PM   #4
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That's my question. Without the center tap do you still use half the voltage for a full wave rectifier?
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Old 3rd July 2016, 03:38 PM   #5
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The full wave option in PSUDII assumes a center tap. You want to use the bridge rectifier version and use the whole secondary value (no center tap means no dividing by 2).
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Old 3rd July 2016, 03:54 PM   #6
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Thanks guys. I should have noticed the schematic for a full wave tube rectifier includes a center tap. I could do a bridge but I would need another 6x4
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Old 3rd July 2016, 04:40 PM   #7
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I've never tried it, but there is such thing as a hybrid bridge. See this page from Merlin:

The Valve Wizard

I don't think PSUDII can model it though.
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Old 3rd July 2016, 04:48 PM   #8
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Quote:
Originally Posted by Sodacose View Post
I've never tried it, but there is such thing as a hybrid bridge. See this page from Merlin:

The Valve Wizard

I don't think PSUDII can model it though.
I've heard one (#26 pre amp post #3648) and it has inspired me to build a type 26 pre. Ironically, full wave without the hybrid bridge.
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Old 3rd July 2016, 05:11 PM   #9
DF96 is offline DF96  England
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Quote:
Originally Posted by mr2racer
I could do a bridge but I would need another 6x4
No, you would need two more 6X4 to make a bridge. This is because dual rectifers almost always have a common cathode, but to make a bridge from two vacuum rectifiers you would need one of them to have a common anode and separate cathodes.
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Old 3rd July 2016, 11:00 PM   #10
Sheldon is offline Sheldon  United States
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Quote:
Originally Posted by Sodacose View Post
I've never tried it, but there is such thing as a hybrid bridge. See this page from Merlin:

The Valve Wizard

I don't think PSUDII can model it though.
You can approximate it. Model a tube bridge, then model a ss diode bridge. Split the differences. It comes out pretty close. Or you can model a half wave tube rectifier, using half the current, to get an approximation. Losses due to a ss diode can be ignored, as they are small.

Sheldon

Last edited by Sheldon; 3rd July 2016 at 11:16 PM.
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