ZX Spectrum Plus3 Power

From HwB

Available at ZX Spectrum +3 & ZX Spectrum +2A.

Pinout

    ---u---
  /         \
 / +5    -12 \
|      0      |  at the PSU cable
 \ +5    +12 /
  \   +12   /
    -------
Voltage Max current
ZX Spectrum +3
Max current
ZX Spectrum +2A
+5V 2A 2A
+12V 700mA 200mA
-12V 50mA 50mA

Source