The Z-50 amplifier was added
to the Project
60 range in June 1970. The Z-30
was rated at 30 watts, so Sinclair decided to advertise
the Z-50 as rated at 50 watts. However, the device expired
at between 37-40 watts, so their designer suggested
30 watts as a rating; the final compromise was 40 watts.
Perhaps not surprisingly, the Z-50 was not a particularly
The amplifier needed more power than the Z-30, so yet
another power supply unit - the PZ8
- was introduced to the Project 60 range in order to
meet the requirement.