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diyAudio Member

Join Date: Dec 2002
Location: USA
How much current will...

How much current will the 6as7g draw running at 150V in this circuit. I looked at the data sheets but just want to have you guyz reconfirm it for me. At around 150V it looks like it will need 20mA, is this about right?

Need to see if a 190V-0-190V 65mA transformer will do the job.

Thanks
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Guiness

 18th April 2003, 04:09 AM #2 diyAudio Member     Join Date: Jan 2003 Location: Milwaukee, WI All depends on the value of R6. Tim __________________ Seven Transistor Labs, LLC Projects and Resources / Electronic Design and Consultation
 18th April 2003, 04:27 AM #3 diyAudio Member     Join Date: Dec 2002 Location: USA R6 R6 is 3.3K 10W resistor... Thanks __________________ Guiness
 18th April 2003, 02:04 PM #4 diyAudio Member     Join Date: Oct 2002 Location: Brooklyn, NY Guiness, That seems about right. I know that with a 2.5K for Rk, and a plate voltage of 250V, a 6080 will draw 50mA. Probably not linear at all in that region though...
 18th April 2003, 08:52 PM #5 diyAudio Member     Join Date: Jan 2003 Location: Milwaukee, WI Um......don't forget there's voltage across the resistor too. Ideally half. Current might be much lower than you expect, given the tube has 75V across it. Tim __________________ Seven Transistor Labs, LLC Projects and Resources / Electronic Design and Consultation
diyAudio Senior Member

Join Date: Aug 2002
Location: Belgium
TOO MUCH OF A GOOD THING...

Hi,

Quote:
 Need to see if a 190V-0-190V 65mA transformer will do the job.
If you're opting for a circuit like this one you're still going to have to burn off a lot of volts...that idea may heat your room in the winter but it's a bit overkill won't you say?

Cheers,
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Frank

diyAudio Member

Join Date: Dec 2002
Location: USA
Actually...

I was going to use this power supply. I do like yours but it may be a bit of an overkill with the dual 6z4's. Hopefully I am not missing something
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Guiness

 19th April 2003, 12:46 AM #8 diyAudio Senior Member     Join Date: Aug 2002 Location: Belgium BOP TILL YOU DROP. Hi, Just kidding but...a lot will depend on the voltage drop of your rectifier tube AND the value of the dropping resistor. Either way you're going to dissipate alot of heat with that PT. Actually, you can use that PT to feed each channel independently and still arrive at the desired B+. It wil double component count at that stage though but I would certainly prefer that to the other solution. Cheers, __________________ Frank

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