Printed Resistors PCB / Polymer Thick Film resistive tracks.
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100pcs SMT DIP Adapter Converter 0805 0603 0402 Capacitor Resistor LED Pinboard FR4 PCB Board 2.54mm Pitch SMD SMT Turn To DIP|turn board|turn ledp p - AliExpress
A piece of PCB for paralleling two TO-3 transistors with 100 mΩ ballast resistors made of PCB traces and also there's room for a base emitter resistor, bought from a salvage store. :