We found this circuit in a 1977 documentation. The National Semiconductor's LM380 is no longer easily found, but if used on this amplifier it provides excellent reproduction quality.
This is the traditional configuration of the LM317 that appears in applications and other circuits on...
This configuration can be found elsewhere in this section. This was obtained from old RCA...
This circuit produces a clef sound when a pulse is applied to its input. The damping effect is...