RNM published this design in The Audio Amateur 1/1982 -- there were a couple corrections in 2/1982. It features very low input impedance and use of easily attainable components, no "impossible to source high gm P-jfets". I've changed the schematic to reflect the corrections, and updated to include the OnSemi devices which are readily available as well, and more easily attached to a heat sink:
[IMGDEAD]http://www.tech-diy.com/Preamplifiers/MarshMC/MarshPrePreMJE.gif[/IMGDEAD]
It was suggested in the "Bipolar Transistor Tester" thread that 2N4400/03 would be lower noise. Of course component values would have to change. Could also use the THATCorp low noise P and N matched transistors.
[IMGDEAD]http://www.tech-diy.com/Preamplifiers/MarshMC/MarshPrePreMJE.gif[/IMGDEAD]
It was suggested in the "Bipolar Transistor Tester" thread that 2N4400/03 would be lower noise. Of course component values would have to change. Could also use the THATCorp low noise P and N matched transistors.