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23rd December 2012, 06:50 AM
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#14 |
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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Read what Kevinkr wrote.
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23rd December 2012, 07:11 AM
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#15 |
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diyAudio Member
Join Date: Mar 2007
Location: Auckland, NZ
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op, why do you want a ccs in the cathode?
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24th December 2012, 02:57 PM
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#17 |
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diyAudio Member
Join Date: Oct 2006
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What post #9 says. LED in the cathode is all good.
See the 6SN7 stage in the attached schematic. |
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24th December 2012, 03:25 PM
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#18 |
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diyAudio Member
Join Date: Oct 2003
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Just to see if I can find a solution to the problem, without trying to justifying it.
Problem to solve : low noise CCS 7.5mA at 2V headroom. Proposed solution : 5x heavily-degenerated 2SK246BL with matched Idss in parallel, and 1x 100~125R common source resistor (for all 4 FETs) to generate the negative Vgs as required. Adjust resistor value to achieve 7.5mA. Should be lower noise also than a BS170, and without the added complication of an opamp-based circuit. Patrick
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24th December 2012, 04:30 PM
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#19 | |
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diyAudio Member
Join Date: Jun 2008
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Quote:
My new years resolution is to build a 6SN7 stage with a horizontal load line to drive an 845 transmitter triode. I have some DN2540s on order now but am still reading up on the subject and am interested in other schemes. Last edited by Captn Dave; 24th December 2012 at 04:56 PM. |
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24th December 2012, 05:00 PM
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#20 |
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diyAudio Moderator
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Take a look at SY's "His Master's Voice" article for a good example of the cascode CCS I am thinking of: His Master's Noise: A Thoroughly Modern Tube Phono Preamp
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