This circuit was found in a Signetics documentation from the 1980s. The integrated is a PLL and the SCR is a general purpose type The pitch frequency is given by R1 and C1 as formula next to the diagram.
August 2016 - It can be obtained from Mouser Electronics the new VIPer01 high voltage converter...
This circuit can handle 25 A unde a 32 V voltage using a hight power old transistor. This...
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...