I am new to the world of Spectrums, but I have a +2A which isn't powering up. I've tested the voltages on the pins of the connector and none of the voltages being supplied were even close. Given the age of the PSU I was thinking of recapping it, the problem is I can't find any information on the type needed and I can only read the description of the larger ones. Does anyone know what they are?

  • Wet electrolyte capacitors (the ones you'd expect to need to replace) generally have their specs written on them... do these not?
    – Sneftel
    Jun 14, 2023 at 13:07
  • Noting for completeness: modern PSU replacements are available, and are often smaller, cooler and safer given the age of the originals. Keelog is a seller that I happen to have used, but there are probably a multitude of options.
    – Tommy
    Jun 14, 2023 at 13:30
  • They do on the larger ones, but smaller ones are tiny and I can't see anything on them.
    – Darren
    Jun 14, 2023 at 16:21
  • 1
    I was thinking of a replacement PSU too, but I thought I give recapping the old first a try.
    – Darren
    Jun 14, 2023 at 16:22

1 Answer 1


There's a schematic diagram here

It lists the caps values as:

  • C1 - 6800μF 16V
  • C2 - 1000μF 25V
  • C3 - 330μF 25V
  • C4 - 100nF
  • C5 - 100μF 16V
  • C6 - 100μF 16V
  • C7 - 100μF 16V

Compare the diagram for your specific PSU, Sinclair tended to rearrange and re-number the components a lot.

  • Brilliant thank you for this. I'll order those.
    – Darren
    Jun 14, 2023 at 16:22

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