K&K Audio / Lundahl Transformers

Welcome! Need support, you got it. Or share youe ideas and experiences.

Return to K&K Audio / Lundahl Transformers


Message Sort: Post Order or Asylum Reverse Threaded

Two Terminal Constant Current Source

202.40.157.7

Posted on March 8, 2017 at 23:57:08
pushpulltriode
Audiophile

Posts: 772
Joined: September 20, 2000



Hello!
Can I use your CCS to replace the DN2540 for this circuit?

Thanks!

 

Hide full thread outline!
    ...
RE: Two Terminal Constant Current Source, posted on March 9, 2017 at 05:36:23
KevinC
Manufacturer

Posts: 2911
Location: NC
Joined: April 19, 2001
The current source shown in the schematic is the same as that I sell under the name of Cascode Current Source Kit. You will need a heat sink kit to add to this. The devices used in the kit (IXTP08N100D2) are more transparent sounding than the DN2540.

Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: Two Terminal Constant Current Source, posted on March 10, 2017 at 07:02:29
pushpulltriode
Audiophile

Posts: 772
Joined: September 20, 2000



Dear Kevin,
Thanks for the advice!!

I have a question on my friend behalf.

Here is the stock circuit of Sonic Frontiers SFL-2, and I will post another 2 pictures that marked CCS for your Cascode Current Source Kit. Which one do you prefer? or you prefer both of them.

 

CCS1, posted on March 10, 2017 at 07:03:40
pushpulltriode
Audiophile

Posts: 772
Joined: September 20, 2000



Here is another one.

 

CCS2, posted on March 10, 2017 at 07:04:46
pushpulltriode
Audiophile

Posts: 772
Joined: September 20, 2000



.

 

RE: Two Terminal Constant Current Source, posted on March 12, 2017 at 00:25:18
Tubenstein
Audiophile

Posts: 159
Joined: August 5, 2011
I am curious the possibility to replace those 422r resistors with your compact ccs?

 

RE: Two Terminal Constant Current Source, posted on March 12, 2017 at 17:46:13
KevinC
Manufacturer

Posts: 2911
Location: NC
Joined: April 19, 2001
The voltage across the 422R resistors is probably too low for the compact cascode CCS to work properly. I would need to be 20-25VDC.

Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: Two Terminal Constant Current Source, posted on March 12, 2017 at 17:50:06
KevinC
Manufacturer

Posts: 2911
Location: NC
Joined: April 19, 2001
From a sonic standpoint the biggest improvement would be in replacing the plate resistors for LV2A and LV2B. However, the cascode CCS will work in both locations.

Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: Two Terminal Constant Current Source, posted on March 12, 2017 at 23:37:56
Tubenstein
Audiophile

Posts: 159
Joined: August 5, 2011
I know people owns this preamp but hate the sound of vishay resistor for the position, but good sounding resistor olike tantalum only available in 430R. This is the reason i want to suggest trying your ccs.

 

Page processed in 0.019 seconds.