I just cryoed a batch of guitar pickups. There were eleven of varying types: humbuckers and single coils.
I did measurements on them before and after the immersion process. Measurements were taken on two separate occasions using Fluke and B&K meters both times, measuring L,C,R meters on both occasions. These measurements were repeated after the cryo work using the same meters. On both occasions contacts and wires were cleaned with IPA before measurements to assure good contact.
What I was measuring is the delta (deviation/change) from the measurements before and after cryo. Results were the same (standard deviation) seen in many tests on guitar pickups before using an identical regemin. Here are the results of an average of the multiple DUT. After cryo:
L decreases 1%
C decreases 1.5%
R decreases 1.5%
These results have remained the same in over 100 pickups cryoed. Some configurations show more delta than others, but the standard deviation remains the same.
Aggregate weight of all of the samples remains the same every time.
What this indicates is an overall compaction of the DUT. This will give exactly the results that the measurements indicate. This would equate to an increase in density.
I keep trying to figure all of this out and quantify what is heretofore unquantifiable. Someday, maybe.
I need a gauss meter to start checking magnets next. I just don't want to be disassembling all of these pups.
Dave
