These were used to cool the output transistors down which were soldered flat on pcb.
Flexible PCB High Quality Single Side Perfboard Veroboard Prototyping 30x18cm
DIY High Quality Aluminum Heat Sink 70mm x 25mm x 10mm for LED PCB Chip IC
Briggs & Stratton SAE30 High Quality Engine Oil For 4-Stroke Lawn Movers Black
High Quality Omega Low Voltage Heater Mat KHLVA-0502/5-P .Temperature Control.
830 MB-102 Tie Point High Quality Solderless Breadboard
???????? BusBoard Prototype Systems solderless breadboard, BPS, actual high-quality
