Why does he measure with the clamp held near the coils/wires rather than clamping it on the output?
I think it was the braggart in him.
The fact that such a high reading was possible, with the clamp closed and no conductor going through the middle, should indicate to anyone familiar with how these meters work how unique the TPU base functions were.
Short of the possibility electronic noise causing unstable meter displays there is no way these meters will show a stable reading unless current is actually flowing through the center of the closed jaws.
Now, guessing that he was actually measuring current (with no conductor) then he could convert current readings to collector output voltage.
Consider how a current transformer works. The more current flowing through the clamped conductor - the more voltage is output from the current transformer.
If I'm correct, the collector output a voltage because he found a way to invert the function of a magnetic field generated around a current carrying wire.
In other words, he created collector current by generating the magnetic field around the collector. This wouldn't be classic induction because rotation of that magnetic field around the wire would be needed (perhaps better put as - the field would be unipolar).
Just creating a mag field around a conductor won't generate current unless the field is changing - or spinning.
"As far as the laws of mathematics refer to reality, they are not certain; as far as they are certain, they do not refer to reality." - Einstein
"What we observe is not nature itself, but nature exposed to our method of questioning." - Werner Heisenberg