$30 eBay 937D soldering iron teardown and review
TL;DW - It's really surprisingly good considering the price. I'll be buying more for my soldering classes.

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Yihua Hakko 936 Soldering Station Comparison

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Yihua 937D first look - Correcting my mistake!

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Fake Hakko FX-951 soldering iron review & teardown.

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Before You Recap Your Vintage Receiver... Watch This

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YiHua 937D and 939D+ Solder Stations Overview

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EEVblog #1065 - Soldering Iron Power Delivery Explained

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Soldering Complete Tutorial for Beginners | Leaded, SMTs, Chip【Step by Step】

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The Most Satisfying Machines That Are At Another Level!

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$35 Soldering Station Followup - 936 eBay Chinese Knockoff

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AIXUN T3A Soldering Station Review ll JBC iron comparison

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Yihua 995D soldering station

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Solder won't stick

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Inside a cheap Chinese Yihua soldering iron.

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Under $20 Soldering Irons – Are Any Of Them Usable

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Desoldering Made Easy - Amazing Trick || Soldering Tutorial

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Before You Trash Your Old PC Power Supply... Build This!

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