Found in Ferranti's 1969 documentation this circuit has a maximum operating frequency of 7.5 MHz. The circuit can be designed with modern transistors.
It can be obtained from Mouser Electronics new crystals for surface mounting from AVX with...
This effect for guitar was found in an English magazine from 1978. The transistors can be the most...
This circuit was published in a January 1971 issue of Radio Electronics to check television...