Avian's Blog: Another ZX Spectrum's near-death experience
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Plastic plug modern switching 5V+12V replacement PSU for ZX Spectrum +2A/+2B/+3 | ByteDelight.com
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MyVolts 9V Power Supply Adaptor Compatible with/Replacement for Sinclair ZX Spectrum 48K Computer - US Plug with Extension and ON/Off Switch - Amazon.com
Sinclair ZX Spectrum Power Supplies – What Types Are There (Part 1)? – PopeyMon Games and Fun
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ZX Spectrum PSU Modern Black US - Replacement ZX Spectrum Power Supply, US Plug