Noisy 9V Batteries?! & An odd issue with an RCA 5T Radio

[vortalexfan]

Hello everyone tonight I was listing to my 1937 Coronado 630B Battery Powered Farm Radio and I was trying to tune in some stations and all of the sudden starting around 900 kHz on the dial and going down I heard a terrible buzzing noise (assumed electromagnetic interference) and it got worse the lower on the dial I tuned.

The weird thing is that the buzzing noise would go away as soon as I took my hand away from the radio, and so something I did was I waved my hands over the whole radio until I got by my 90v "B" Battery pack (10 9V batteries daisychained together) and when I touched the "B" battery pack the radio buzzed so loudly that the radio was not able to pick up anything but EMI Buzzing but then when I moved my hands away the buzzing cleared up and the radio came in fine.

I thought that the whole point of a battery set was that it wouldn't pick up EMI as easily or other AC line noise?

Anyways, has anyone ever heard of 9V batteries that emitted EMI when touched? I certainly haven't, sounds to me like defective batteries...

Any ideas anyone?

Also as a side note I have an RCA 5T AM/SW radio that I recently finished restoring electrically and that radio picks up stations quite well on both AM and Shortwave during both day and night, but something I've noticed recently is that between 540 and 1300 kHz on the dial I hear a loud buzzing noise similar to the noise I just talked about that my Coronado radio making except that the RCA 5T does it all the time regardless of whether or not I'm touching the receiver or not.

The noise oddly enough is affect by when my house's AC unit kicks on and off (when the AC unit kicks on it make a popping noise on the radio and the volume cuts down by almost half of what it was playing at previously and the buzzing noise goes away, but then when the AC kicks off the radio goes back to full volume and the buzzing noise returns so I'm not sure what's going on there.

Its acting almost like an AVC issue but the AVC should't be affected by the simple act of an AC unit kicking on should it?

Any help with these issues would be appreciated.

Thanks.