I believe the original poster is referring to vacuum tube radios. If you're not building one yourself, your only option would be to buy a used vintage radio. For this price range, you can mainly consider brands like Hanrongda and some smaller manufacturers, or you could also purchase a DE-990 for around 40 yuan/RMB. If you're looking for more versatility, the original poster could also consider an SDR (Software Defined Radio), but you would likely need to purchase a suitable antenna separately.
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