真空管・並三ラジオをジャンク５００円チューナーから作る
Go back to your childhood and make a regenerative radio with one vacuum tube. Nowadays, you can buy junk AM/FM tuners at Hard Off or Yahoo! Auctions for around 500 yen. For analog dial type, you can get the air variable capacitor with reduction mechanism and the power transformer as spare parts. If you use this to make your own chassis and coil, you can complete a 3-inch radio with almost no money.
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