This 50 W amplifier was found in the November 1983 Radio Electronics issue. The circuit is suitable for the case and includes a preamp with tone control using off-the-shelf components.
Found in a Popular Electronics from 1992, this circuit uses a PLL567 in an audio meter bridge that...
This circuit was found in a 1991 publication. The transistor can be a general-purpose type....
This is a different circuit for a component from the past, the zirconium arc lamp used in...