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Old 20th May 2010, 09:11 AM   #1
Skorpio is offline Skorpio  Denmark
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Default Confusion about Rectified voltage...

I have some 450V RIFA capacitors I would like to use in the PSU for my simple SE.

The rectifier will be GZ34 and transformer is 335-0-335/300mA type.

The current draw will be between 120-140mA total, and in the Philips datasheet on GZ34 the DC voltage with a 60uF capacitor can be read for the curves. I find a voltage here between 398-410V depended on current draw.

On the other hand using this calculator site:
http://www.dreamtone.org/Calc-Current-Draw.php

I get voltages between 442-469V at the closest trafo voltages...?

Something must be wrong somewhere?
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Old 20th May 2010, 12:32 PM   #2
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Quote:
I find a voltage here between 398-410V depended on current draw.
Experience shows that to be closest to what you will actually get. It really depends on what voltage your power transformer actually delivers in circuit under load. I have used some Hammond 300-0-300 volt transformers that actually deliver 320-0-320 and I get 360 volts of B+ in a Simple SE. I have also used some surplus 330-0-330 volt transformers that give me 400 volts of B+. The voltage might spike to nearly 450 volts if the rectifier warms up faster than the output tubes (usually the case). Your caps should have a 500 volt or so surge rating so this is OK.
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