Solax X1 - 1.1-S-D(L) Inverter
€ 200
Used
Already in poor condition, as can be seen from the adhesive tape holding it together. Something rattles inside, perhaps a piece of plastic. I don't have a ZX Spectrum to test it, but according to the multimeter shown in the photo, it appears to be functional. It came from a ZX Spectrum+, which was a 48K model with a keyboard similar to that of the 128K. Including postal shipping, the price is 20 euros.

olx