If I remember correctly they sent 25A thru as the test current, bad joints were shown up but also the the fizz bang crackle had the tendency to weld the joint to such an extent that it actually had a tendency to cause a weld which might have caused a bit of continuity correction as a result.
I have not seen one for a while though. Ho happy days!
That's correct, they used a transformer, to reduce the voltage/increase the level of current, and the length of time you could press the button for, was quite limited, due to the unit overheating.


