This circuit is from Mullard 1969 documentation. The circuit operates at a relatively high supply voltage and has a 10 Vpp output. The transistors are of the time, but admit equivalents.
We found this circuit in an 80's Radio Electronics. It can still be easily assembled as the used...
This source was found in a 1982 American publication, but can be easily assembled using 2N2995 (PNP...
This ultra-low noise circuit was found in the May 1990 issue of Radio Electronics magazine. The...