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Old 25th July 2007, 08:14 PM   #1
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Default Question on Bridge Rectifer

Hi Everyone

This is my first post, I'm a newb here. I have been collecting and restoring tube radios for about 12 years. The last few months I've become very interested in tube audio. A friend built me a single ended tube amp and I built a preamp. Both turned out excellent. I have now started on a phono amp.

My question is about the bridge that I bought for my filament supply. I have 6.3 VAC from my transformer. I hooked up the bridge and have 16.6 VDC with no load or no filter cap. I'm puzzled, this can't be right, right?? Seems to be acting as a doubler.

Thanks in advance. Great forum.

David
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Old 25th July 2007, 10:34 PM   #2
KISS is offline KISS  United States
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Join Date: Jan 2007
You probably need a different lesson. Not all AC meters are the same. Most assume a sine wave input. A rectified signal clearly is not a sine wave.

Put your capacitor filter in there and a slight load and things may behave and be closer to 8 volts if I remember my PS design math.

One other thing to watch out for is that selenium rectifiers need to be simulated if you are duplicating earlier designs using this technology. They have a very high series resistance and thus a high voltage drop.
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