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Post subject: Tube rectifier - need some explanation
Posted: Mon Mar 24, 2014 2:32 pm
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Ok, I am totally stumped as to how a rectifier tube takes the high voltage (360v+) from the transformer to pins 4 & 6, which I understand to be the plates, and the second (5v) tap to the heater/cathode on pins 2 & 8 and pumps 360v+ out of one lead of what appears to be the low voltage section of the tube on pin 8?

I read an explanation on another site but it still doesn't make sense. With diodes you're running both B+ to a diode which then goes to the common B+ feed for the caps and other parts of the circuit. With a tube rectifier the B+ doesn't touch the common B+ circuit physically.

This makes no sense to me. How can you get B+ of over 3xx volts from a section of the tube that runs on a 5v supply? Does that make sense or did I not word my question correctly?

:shock: :? :?:

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Post subject: Re: Tube rectifier - need some explanation
Posted: Mon Mar 24, 2014 9:42 pm
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Take a look at this video, it should help out.

http://youtu.be/x5SSKX74DKg

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Post subject: Re: Tube rectifier - need some explanation
Posted: Mon Mar 24, 2014 11:13 pm
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jimolson1963 wrote:
Ok, I am totally stumped as to how a rectifier tube takes the high voltage (360v+) from the transformer to pins 4 & 6, which I understand to be the plates, and the second (5v) tap to the heater/cathode on pins 2 & 8 and pumps 360v+ out of one lead of what appears to be the low voltage section of the tube on pin 8?

I read an explanation on another site but it still doesn't make sense. With diodes you're running both B+ to a diode which then goes to the common B+ feed for the caps and other parts of the circuit. With a tube rectifier the B+ doesn't touch the common B+ circuit physically.

This makes no sense to me. How can you get B+ of over 3xx volts from a section of the tube that runs on a 5v supply? Does that make sense or did I not word my question correctly?

:shock: :? :?:



OK... remember electrons have negative charge. The heater or cathode of the rectifier emits electrons. They pass into the anode when the sine wave is positive, off the PT. Thus, they are emitted into ground via the center tap (CT) of the secondary windings of the PT (that's why most vacuum tube rectifiers need a CT).

The anode wire becomes more positive wrt to ground. So there is, say, a +360VDC differential between the anode wire and ground.

Electrons pass from the ground through the cathode to the anode. Not the other way around.

http://www.webphix.com/schematic%20heav ... _schem.pdf

HTH. :D


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