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In Reply to: RE: Has anyone used LM317 as constant current source posted by Leo loves music on April 08, 2025 at 20:14:21
I've tried numerous active loads and devices in the cathode. In the end nothing sounded as natural and organic as a good resistor.
Don't ignore a simple resistor. Configure it appropriately for a LTP, maybe with a negative voltage if you prefer that.
Follow Ups:
I've been going back and forth with this guy and he's reluctant to use a neg.PS and only has 7V to work with. That would be the "shortest" tailed pair ever and wouldn't work.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
In Reply to: RE: Pros and Cons of 300B PSE and PP posted by JKT on April 13, 2025 at 06:18:17:
Another thought. I can do a -100V negative regulated PS. 100V on CCS. 350V on 6SN7 for inverter stage. 200V on 6J5 for gain stage. It has no issue to output 10V peak to peak to drive 6SN7.
A cascode MOSFET CCS using 8N100D2s only requires 30V across it. With 100V a resistor could work (not as well); but you would have to calculate the difference in plate loads to achieve equal amplitude outputs. With a very high impedance CCS plate load resistors are matched.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
CCS + resistor = problem solved.
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