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An EMP is not jamming.
Wuzak - I am going to give it to you for sheer determination.
It was a PR XVI. NS631 / A52-600
This one. The photo was taken in Wodonga, Victoria, Australia around October 1983.
A few years later it was "swapped" for a C-47 and a few P-51 wings. The swapping was done by one of the three owners without the consent of the other two owners.
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An EMP is not jamming.
Jamming is a counter frequency that obstructs a user from receiving a transmission on a particular wavelength.
An EMP is a burst of energy, like a nuclear weapon (manmade) or a Coronal Mass Ejection (from the sun) and is capable of disabling solid state electronics.
Tube-type devices and "wound coil" electronics are more resistant (but not immune to direct proximity) to these broad frequency electromagnetic events.
I believe that Soviet avionics did not have as many IC chips, in modern jets, due to lack of technology. They relied on vacuum tube technology. They still make vacuum tubes.
I think that they lagged behind the US in chip technology. Anyhow, their vacuum tubes are excellent.
I'm sure you know the answer, what is this item in this Japanese plane?
It's a gyrocompass or just a magnetic compass type 2 or 3 KAI. The recatangular "screen" at its top is a kind of a mirror or prismatic reflector to see the instrument indications. The enlarged shot shows the device interior IMHO.
View attachment 650156
Also see the link ... Compass, KAI, Air Navigation Reflector, Japanese Navy Aircraft