With a 475 V supply, this amplifier published in Radio Electronics magazine in January 1958 offered good power. The amplifier used 4 tubes.
We found this simple alarm circuit in a 1981 documentation. As we can see, it is a car alarm...
We found this circuit in an English magazine from 1976. The magazine no longer exists, but just...
Suggested by General Electric in a 1968 documentation this integrated amplifier uses a component of...