0.82 ohms are very low. Did you experiment with higher value?
I like the way you connect the bipolar and jfet. Did you experience stability problems ?
Yes I did, but I perceived better sound by putting lower and lower I/V resistors. I had to stay at 0.81ohm value because there is no much gain in the circuit.
I have not find any stability problems until now.
It is very similar to the JLH buffer but used as a transimpedance stage. The JLH is parallel symmetric tough. I made several improvements to it and it sounds very good. As low impedance MC input i prefer BJT though, especially since your circuit has no problem with input offset.
Here is the JLH buffer. It goes back to his Lineac circuit where i first saw the possibility to make a low distortion J-Fet - BJt combination.
Ween I get the opportunity I will send to you my idea. But now I am limited to my phone internet , and to my language limitation (English )
Here is some more information about the JLH Lineac :A Paul Kemble web page - John Linsley Hood preamp designs.
Is the output really loaded with a 1kOhm resistor ?
No, it isn't. It was just for simulation. The only load seen by the I/V stage is the 22k volume attenuator located into the power amplifier.
Guys, as far as I listened, this is the best sounding I/V stage I have tested. And i had listened many.
It is very simple to construct, just be sure that jfets are sorted to the same Idss in every similar symmetrically position
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