I found OCL 165 WATTS LANEY from service manual of guitar amplifier CK165 series.
It uses a pair of Darlington Transistors and there is internal driver transistor and signal diode inside.
It uses 50 Volts symmetrical voltage to supply the circuit. And it also using Transistor SAP16 that is an audio purpuse to make audio output up to 160 watts at 4 Ohms load.
Table of Contents
INFO OCL 165 WATTS LANEY CK165
LANEY CK165 is mini powered mixer. It has 4 channel inputs and it has Four potensio to control each channel.
It uses 15″ speaker for make bass frequency looks better.
SCHEMATIC DIAGRAM OF LANEY CK165
The picture below is an edited from the original schematic.
The amps has a Trimpot at a Preamplifier Block to make the output always Zero VDC. It also called with DC-Ofset.
TS10 is a Voltage Amplifier Stages. Its amplify the input signal and make it bigger voltage.
The current through VCC 50V, R17, TS9, VR1, internal Diode of SAP transistors, and R2.
Over Current Protection here uses transistors TS3 and TS4 (MPSA42 and MPSA92).
When the output current passing through resistors R19 and R20 are exceeds 0.7 VDC then its OCP transistor will doing work as well and it will reduce the voltage supply to the Base transistor SAP16N/P so that this will reduce the output current to the load.
No Driver transistors needed. The SAP16 transistors already contains an internal transistor driver inside.
This OCL 165 WATTS LANEY power amplifier does not use a Servo Driver. It only utilizes the internal diode inside the SAP16P module and there is only the addition of a Timpot to limit the idle current in the Final Output.
Another Audio Power Amplifier inside this blog LOOK HERE.
Blogspot of YOHAN AUDIO LINK HERE.