This a power plug I have designed for Spectravideo SVI-728, SV-318 and SV-328. It should also fit the TI99 and ColecoVision.
Here is how to build it.
The original SVI PSU for SVI-728 is marked:
With the original PSU I measured (no accessories connected):
Wow! Did you build a power supply as well? I have a SVI-728 but no PSU :)ReplyDelete