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Old 14th November 2008, 04:23 AM   #1
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Default Resistor before tube rectifier

I'm in the process of throwing this power supply together http://www.diyaudio.de/archive/dac2.pdf ( just grabbing parts from my misc. box ), but I'm not confident in what wattage those 47 ohm resistors should be. I have 3watt resistors... Any help would be appreciated

Thanks

Dave
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Old 14th November 2008, 05:38 AM   #2
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And just to help my understanding a bit... Are those 47 ohm resistors there just to provide voltage drop, or do they serve another purpose? I really need a book on this stuff

Thanks

Dave
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Old 14th November 2008, 05:49 AM   #3
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Old 14th November 2008, 05:57 AM   #4
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Man, somebody saw my previous post before I deleted it...

They appear to be for current limiting. Tube rectifiers don't like too much peak current.

You can calculate the required power rating. Just look at the ECC82 data sheet. You know the plate voltage(260V). You know the grid voltage (-9). Find the current draw from each half from the plate characteristics. Ohms law and P=IV will get you the rest. Don't forget that this current is divided over two resistors.

Look at the data sheet here
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Old 14th November 2008, 06:55 AM   #5
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Hi, habsrock93,

Do you talk about the resistors just connected to EZ80? 47ohm /3 watts is enough to meet any working condition of the tube there,

best regards, laughingboy
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