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Old 10th February 2003, 02:25 PM   #1
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Default toroid Transformer as power Transformer for tube

hi all,
can i use a toroid transformer for tube, will the current kill the tube? tot of using one for 6922 dac output stage.

thanks in advance

rgds
tone
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Old 10th February 2003, 02:41 PM   #2
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Default TOROID.

Hi,

Quote:
can i use a toroid transformer for tube, will the current kill the tube?
As a powerxformer,you mean?
That shouldn't be a problem,even if the xformer can deliver more current it won't kill the tube since the current flow is determined by the chosen operating points.

Cheers,
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Old 10th February 2003, 03:13 PM   #3
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Default thanks Frank

frank:
u have made my diy project so muchhh easier..thank you.


rgds,
tone
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Old 10th February 2003, 03:55 PM   #4
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Default the only thing you have to be careful of

is that the insulation is sufficient for tube operation -- let's say you have a 120 VAC primary and 24V secondary and you have instead hooked up the secondary to the mains. There will now be 600VAC on the "new" secondary -- this is the point at which the insulation may begin to break down (I take data from USA Cable). Keep in mind too that your line voltage will swing over 10% during the day.

This shouldn't be a problem until you get to over 600V on the secondary. At any rate, fuse the darn thing and make sure to place the little rubber pad which comes with the torroid underneath it as a further bit of insulation.

Reversing transformers from their intended application has been used from time immemorial to derive bias voltages or obtain a regulated voltage.
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Old 10th February 2003, 04:05 PM   #5
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Uhm...

If you put more voltage (or a lower frequency) across a transformer than it's rated for, it produces a stronger internal magnetic field. Iron has a certain maximum magnetic level, known as saturation. To save space, manufacturers run their transformers close to the limits - close to saturation, for instance. Thus, any increase in voltage and/or decrease in frequency will cause saturation.

Now, what saturation is, is the iron is bottoming out, magnetically speaking. What happens electrically is the inductance goes phut, turning the winding from an inductor (which, in and of itself, draws little current) back into a plain wire. Thus, on saturation, you get a few ohms instead of several kohms, and this makes a *LOT* of heat. This will generally smoke the transformer, putting itself out of its misery. Of course, then you end up with a terrible odor in the room, a blown circuit, and a dead transformer.

Tim
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Old 10th February 2003, 04:37 PM   #6
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Default ???

Hi,

Quote:
can i use a toroid transformer for tube, will the current kill the tube? tot of using one for 6922 dac output stage.
Where do you guys read anything about reverse wiring a toroid in this?

Surely toroids can be had that put out, say, 200 VAC?

Cheers,
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Old 10th February 2003, 04:52 PM   #7
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it was my belief that he wanted to power the amp with a torroidal based power supply, and had, at hand, a LV unit to press into service.

Jack
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Old 11th February 2003, 08:57 AM   #8
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Default toroid

hi all,
he! he!

frank & jack: u are right.

thanks for the advice guys.

best regards,
tone
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