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Old 18th April 2003, 03:07 AM   #1
Guiness is offline Guiness  United States
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Default 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.

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Old 18th April 2003, 04:09 AM   #2
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All depends on the value of R6.

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Old 18th April 2003, 04:27 AM   #3
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Default R6

R6 is 3.3K 10W resistor...

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Old 18th April 2003, 02:04 PM   #4
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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...
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Old 18th April 2003, 08:52 PM   #5
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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.

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Old 18th April 2003, 11:38 PM   #6
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Default 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?

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Old 19th April 2003, 12:07 AM   #7
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Default 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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Old 19th April 2003, 12:46 AM   #8
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Default 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.

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