Which SS CCS for the plate load on a 6N1P?

Brit01 · 04:53 PM

I've got:

4 x DN2540
6 x 2N6520
8 x 2N3906
4 x LM317
8 x 2N3904
4 x IRFU310

Seen various designs and discussions involving these and not sure where to begin. Simple cascade involving 2 x DN2540's? So many opinions out there.

Needing a CCS for a plate load on a 6N1P linestage.

Currently using a SV83 as a CCS on the plate but would like to try a solid state CCS. Using led bias on the cathode.

Suggestions would be appreciated.

Thks

SY · 30th January 2010, 04:41 PM

Quote:

Simple cascode involving 2 x DN2540's?

Hard to beat the performance of that. And it's as simple as it gets.

Brit01 · 30th January 2010, 05:28 PM

Have you got a schematic handy for this simple cascode design?

Thks SY.

SY · 30th January 2010, 07:11 PM

CCS transistor choices

Brit01 · 30th January 2010, 07:18 PM

Thks SY.

Just spent the last hour trying to find that through all the threads.

Brit01 · 30th January 2010, 08:26 PM

SY

Am I going to need some small heatsinks for the DN2540's?

Maybe going to pull 20mA with the 6N1P.

SY · 30th January 2010, 08:30 PM

Quote:

Originally Posted by Brit01

SY

Am I going to need some small heatsinks for the DN2540's?

Maybe going to pull 20mA with the 6N1P.

You may need a heat sink on the top FET, since it has most of the voltage across it. But maybe not- it depends on what you're trying to get your circuit to do- if it's a low level circuit with minimal swing requirements (a few volts), then you can set the B+ to be 30V or so higher than the predicted plate voltage. That way, dissipation at 20mA will be half a watt or less. If you're trying to swing lots of volts, then yeah, you'll have to make the B+ higher and heat sink the top one.

Brit01 · 1st April 2010, 11:00 PM

Not sure which is the gate,source or drain on this diagram.

Please can someone advise?

SY · 1st April 2010, 11:18 PM

In that drawing, source is on the bottom, gate in the middle, drain on top.

Brit01 · 2nd April 2010, 12:16 AM

Thxs SY.

Also another doubt:

What wattage resistors are used here? (eg with 220 B+).
Are they just setting the idle current?

30th January 2010, 04:34 PM	#1
Brit01 diyAudio Member Join Date: Jul 2008	Which SS CCS for the plate load on a 6N1P? I've got: 4 x DN2540 6 x 2N6520 8 x 2N3906 4 x LM317 8 x 2N3904 4 x IRFU310 Seen various designs and discussions involving these and not sure where to begin. Simple cascade involving 2 x DN2540's? So many opinions out there. Needing a CCS for a plate load on a 6N1P linestage. Currently using a SV83 as a CCS on the plate but would like to try a solid state CCS. Using led bias on the cathode. Suggestions would be appreciated. Thks Last edited by Brit01; 30th January 2010 at 04:53 PM.

30th January 2010, 07:11 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	CCS transistor choices __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

1st April 2010, 11:18 PM	#9
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	In that drawing, source is on the bottom, gate in the middle, drain on top. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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30th January 2010, 05:28 PM	#3
Brit01 diyAudio Member Join Date: Jul 2008	Have you got a schematic handy for this simple cascode design? Thks SY.

30th January 2010, 07:18 PM	#5
Brit01 diyAudio Member Join Date: Jul 2008	Thks SY. Just spent the last hour trying to find that through all the threads.

30th January 2010, 08:26 PM	#6
Brit01 diyAudio Member Join Date: Jul 2008	SY Am I going to need some small heatsinks for the DN2540's? Maybe going to pull 20mA with the 6N1P.

2nd April 2010, 12:16 AM	#10
Brit01 diyAudio Member Join Date: Jul 2008	Thxs SY. Also another doubt: What wattage resistors are used here? (eg with 220 B+). Are they just setting the idle current?

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