EMI pickup device (mailbag)

[SGI]

Hello Dave's aficionados!
A tough question for you... Once upon a time in the Mailbag section somebody sent in an homebrew device which only purpose was...
picking up EMI from electric/electronic appliances!
Sorry I'm unable to provide any more info... I just remember that this cute gadget could tune in on EMI by swiping it all over the device under test!
I'm into electronic music and from time to time - in my earphones - I can barely hear this noises that sometimes has excellent rhytmical features!
Unfortunately I can't amplify them enough to be usable in my "choons"!
Sounds weird, huh? 
I'd love to buy the kit to build that!!
Have a nice day,
Francesco

[frozenfrogz]

H-field probe into a suitable instrumentation amplifier maybe?
Check Daves videos from one / two weeks ago where he DIYs one of those from coax and recommends a decently cheap amp.

[SGI]

I'll check that!
Maybe Dave himself would remember?
Or the creator of the instrument??
Cheers

[magic]

Frankly, you could just record it from the headphone jack of whatever device you have which picks it up.

[Fire Doger]

https://www.eevblog.com/forum/blog/eevblog-1178-build-a-$10-diy-emc-probe/

Are you referring to noises similar with the sounds made when you make a call near a cheap speaker?