This is a classic FM amplifier IF amplification stage configuration. The circuit is from a 1980s documentation. CN is the neutralizing capacitor.
We found this circuit in an American publication from the 1990s. Any FET can be used. The circuit...
This small power supply with selenium diode appeared in Radio Electronics in October 1958. The...
The instrument is a common multimeter on the lower voltage scale. The FET can be BF245 or MPF102. The...