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RE: Has anyone used LM317 as constant current source

100.2.133.74

Leo loves music

In Reply to: RE: Has anyone used LM317 as constant current source posted by JKT on April 08, 2025 at 22:00:49

LM317L should work well with 6SN7.

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RE: Has anyone used LM317 as constant current source - JKT 14:23:38 04/09/25 (1)
It will work; just not as well. If you don't want to deal with a negative PS go for it. I have used cascode MOSFET CCS with 6SN7 diff. pairs to good effect.

"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
- Just a Note on Using LN-317 as a CCS - JKT 14:39:03 04/09/25 (0)
  Walt Jung published an article in AudioXpress on Current Sources. One of the circuits was a cascode based on the LM-317. Dave Davenport of Raleigh Audio implemented it in his Line Stage kit as a plate load. At the time I had one of his Line Stages and I tried it. It caused a noticeable amount of White Noise. This was due to the LM-317. I don't know how much this would effect its use as a tail impedance; but, as a plate load, unacceptable.
  
  "It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln

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