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Upgraded Sinclair Spectrum 48K Rubber Keys with ZX power supply


Thanks for looking at our Sinclair Spectrum 48K computer – Upgraded to work with new tv’s and comes with an original Sinclair PSU.

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Sinclair Spectrum 48K with rubber keys and video output upgraded.  Comes with ZX power supply.

Issue 3B Board!

RDR Spectrum 48k - SN_001-513602-20230211_113537We have completed the following work:

  • Changed the RF output for a composite video modification so that it will work on all modern TV’s through their AV Video phono connector.
  • Replaced all electrolytic capacitors.
  • Replaced the power socket.
  • Replaced the regulator.
  • Replaced TR4 and TR7.
  • Replaced the speaker.
  • Socketed and replaced RDR Spectrum 48k - SN_001-513602-20230211_113555IC22 (upper RAM chip).
  • Added a ceramic heatsink to the ULA.
  • Cleaned the cases inside and out.
  • Fully tested the Spectrum with diagnostics for a few hours to make sure RAM was working well. All tests passed.
  • Tested it playing games.
  • Replaced the membrane.
  • Replaced the electrolytic capacitor in the ZX power supply and fully tested its output.


This is a genuinely nice, clean ZX Spectrum that has been refurbished well so that it will serve a good number more years to come.

There are some wear and tear marks on the metal faceplate as well as a small repair to the side of the case. Please see pictures.

Any questions please get in touch!

Additional information

Weight 3 kg
Dimensions 45 × 35 × 16 cm

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