Capacitor Lists (48K Range)

The following lists describe the replacement capacitors required for all machines in the Spectrum 16/48K range.

They are all axial types unless otherwise indicated, and all 85°C type unless otherwise indicated.

When choosing replacement capacitors, the important part to match is the capacitance (1uf, 22uf etc.). The voltage rating must be equal or larger than the given values below, so a 1uf 63v capacitor can replace a 1uf 50v part, but not the other way round.

Also be mindful of the size of replacement parts – most suitable capacitors will be 10-12mm long, and between 5 and 10mm in diameter.

See our page on capacitor replacement if you need further guidance on the process itself.

Issue 1

These machines do not have the capacitor designations on the silkscreen, so instead consult the below annotated picture for location, type and rating of capacitors installed on this board.

Click for larger version.

Issue 2

C25 22uf 10v
C27 1uf 50v 105°C
C28 22uf 10v
C34 22uf 10v
C44 100uf 16v
C45 100uf 16v
C46 1uf 50v – Note: silkscreen indicates incorrect polarity, install backwards to the indicated polarity.
C47 22uf 10v 105°C
C50 22uf 10v
C65 100uf 16v (May be a ceramic part on some units, no need to replace if so)
C74 4.7uf 5v min. Service modification, radial.

Issue 3

C25 22uf 10v
C27 1uf 50v
C28 22uf 10v
C34 22uf 10v
C44 100uf 16v
C45 100uf 16v
C46 1uf 50v
C47 22uf 10v Deleted per service mod on some units
C50 22uf 10v
C65 22uf 10v
C74 4.7uf 5v min

C78 22uf 10v Service modification, below R/H keyboard molex and D15/D17
C79 1uf 50v Service modification, in place of D16

Issue 3B

C25 22uf 10v
C27 1uf 50v
C28 22uf 10v
C34 22uf 10v
C44 100uf 16v
C45 100uf 16v
C46 1uf 50v
C47 22uf 10v Deleted per service mod on some units
C50 22uf 10v
C65 22uf 10v
C74 4.7uf 5v min

C78 22uf 10v Service modification, below R/H keyboard molex and D15/D17
C79 1uf 50v Service modification, in place of D16

Issue 4A

C25 22uf 10v
C27 1uf 50v
C28 22uf 10v
C34 22uf 10v
C44 100uf 16v
C45 100uf 16v
C46 1uf 50v
C47 22uf 10v
C50 22uf 10v
C65 22uf 10v
C74 4.7uf 5v min

Issue 4B

C25 22uf 10v
C27 1uf 50v
C28 22uf 10v
C34 22uf 10v
C44 100uf 16v
C45 100uf 16v
C46 1uf 50v
C47 22uf 10v
C50 22uf 10v
C65 22uf 10v
C74 4.7uf 5v
C79 1uf 16v
C80 22uf 25v

Issue 4S

C25 22uf 10v
C27 1uf 50v
C28 22uf 10v
C34 22uf 10v
C44 100uf 16v
C45 100uf 16v
C46 1uf 50v
C47 22uf 10v
C50 22uf 10v
C65 22uf 10v
C74 4.7uf 5v min
C78 22uf 10v

Issue 6A

C25 22uf 10v
C27 1uf 50v
C28 22uf 10v
C34 22uf 10v
C44 100uf 16v
C45 100uf 16v
C46 1uf 50v
C50 22uf 10v
C65 22uf 10v
C74 4.7uf 5v min
C79 1uf 16v
C80 22uf 25v

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