This circuit, with a configuration like to many that we can find in this section, was suggested by a manual from the 70's. Any general purpose JFET can be used as the MPF102 or BF245 consumption is very low.

This circuit, with a configuration like to many that we can find in this section, was suggested by a manual from the 70's. Any general purpose JFET can be used as the MPF102 or BF245 consumption is very low.