In the early 1980's Western Electric re-vamped their electronic gear; lots of high-gain low-noise amplifier modules got recycled. The big deal about those modules was the 150 microns of silver and 50 microns gold over-plating that was used instead of copper in the ceramic PCB's. The things were about 10 square inches in size; beautiful! The ceramic, silver and gold were engineered to be as noise-free as possible at room temperatures. I saw hundreds of pounds of these things going out the door during a major tear-out operation. Yes, I grabbed a few. Yes, the gold and silver were thick enough to scrape off with a blade. Yes, if you were careful, the silver could be peeled off the ceramic. No, I didn't know/appreciate what I had...
the white rare board with the traces those are groups of cell antennas. every T shaped is a gold plates mini antenna that work together with the others for more signal gain. good find. hard to find this days.
second one the best board ever, the transistors TO-126 and T0-92 packages are gold plated inside, the square marked сп5 contain Ag/Pd also you have yellow and green capacitors, the first ones have Ag/Pd the green ones same like first but sometime Pt is present.
@gold recovery I have a 24k gold plating factory Use copper wire for connection. When I take the wire out of the paint basin, it will be gold-plated Can I extract gold coated with wires? For information, the amount of wires is half a kilogram, and it has a period of 5 years. Does gold remain with wires in this period or not?
Gold prices were artificially kept low in the US until the 1970's; $35/ounce was set by the Federal Reserve. Once gold ownership was made legal in 1974, the prices shot up overnight. Prior to public ownership, the cost of gold in electronics was shrugged off due to the properties gold brought to the table. So manufactures threw heaps of gold parts into the mix: it cost more in some instances to gold-plate a part than it did to make the whole part solid gold! Once the gold markets went crazy, electronics saw much less use of the metal. If you can find parts made before 1974, they will be very rich ore! Modern chips still use gold lead-wires internally, but they are a tiny amount.
@1:47 you missed the best part of this board - the capacitors - the so called "KM" with very high Pd content on the brown - yellowish ones, and Pd, Pt on the green ones
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