This circuit was found in a 73 magazine for radio amateurs from the 90s. The circuit uses high voltage transistors and the relay is high voltage as well.
Active with the output at the high level, this oscillator was found in November 1984 Radio...
The coil and sockets of this circuit found in a QST depend on the frequency band that is intended...
We found this circuit in an old American documentation. The operational amplifier is from the time...