original power supplies

[David G]

Mark, thanks for the information above on the fuses


The ZX81 UK version most commonly shipped with a 700ma (0.7 amp) output supply. It is identical in looks to the UK 1200 version, with 2 differences in the labeling

• Model: UK 700

• OUTPUT: 9v DC AT 700ma. Not powerful enough to power both the ZX81 and the ZX Printer

• shape: rectangle with upswept top to match the ZX81 case

sinclair
ZX POWER SUPPLY
IN: 240v AC ~ 50Hz.
OUT: 9v DC AT 0-7A. [instead of 1-2A]
DISCONNECT FROM MAINS WHEN NOT IN USE.
FOR INDOOR USE ONLY.
UK 700 [instead of UK 1200]

the bottom is labeled:
sinclair
ZX POWER SUPPLY
MADE IN UK

[David G]

The EURO 700 PSU is identical to UK 700 version, with 3 differences: model number, input voltage rating, and the mains plug being of the continental kind

• Model: EURO 700

• OUTPUT: 9v DC AT 700ma. Not powerful enough to power both the ZX81 and a printer

• shape: rectangle with upswept top to match the ZX81 case

sinclair
ZX POWER SUPPLY
IN: 220v AC ~ 50Hz.
OUT: 9v DC AT 0-7A.
DISCONNECT FROM MAINS WHEN NOT IN USE.
FOR INDOOR USE ONLY.
EURO 700

2-terminal Type C Europlug, commonly used in Europe, South America & Asia


the bottom is labeled:
sinclair
ZX POWER SUPPLY
MADE IN UK
Like the other Sinclair "Made in UK" PSUs, it likely has an internal thermal fuse