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We have developed such a simple and very effective system for cooling transistors and diodes. Take it into service. ID-Cooling DK-19 PWM cooler https://alii.pub/6y5oe9 Copper busbar 4mm 4cm x 25cm https://alii.pub/6y5off ============================================ We have been buying original transistors and microcircuits for many years here: https://alii.pub/6xbvu2 There have never been any fakes or remarking. If you did not find the part you need by searching, write a private message to the seller. He will respond within 24 hours. If you have recently bought radio components on Ali, then you will be surprised by the high price of parts in this store. But this is precisely because they are original. Multifunctional tester for beginners https://alii.pub/6vis9s Universal and high-precision multimeter https://alii.pub/6visic Budget laboratory power supply https://alii.pub/6visor High-quality laboratory power supply https://alii.pub/6visr3 Linear laboratory power supply https://alii.pub/6visvr Chinese clone of RTL SDR receiver from 25 MHz https://alii.pub/6viu5n (to receive HF frequencies, you need to solder the converter!) Chinese clone of RTL SDR with a converter from 100 kHz https://alii.pub/6viu6m (for good reception, you need a full-size HF antenna outdoors) 12-bit SDR receiver https://alii.pub/6w9b1j Infrared camera + macro lens https://alii.pub/6viutk (an indispensable device for design and repairs, immediately you can see where, what and how much the radio component is heated) Oscilloscope for the little ones: https://alii.pub/6zf5eh (you can watch low-frequency signals, but the transistor tester in it is excellent) 8-bit Oscilloscope for a beginner radio amateur https://alii.pub/6zf5fg 12-bit Oscilloscope for an experienced radio amateur (meander up to 15 MHz - like on a color TV) https://alii.pub/6zf5f9