I'm going to start exploring the typical sorts of noise that might get onto your tape and how to deal with it. If you can deal with it at all!!!
Let's start with RF Noise. This is usually from mobile phones. But there are other electrical devices that can generate noise. If your mic doesn't have RF shielding then might be vulnerable. 

PRODUCTION NOTES
Recording Mic: MPOW 071 USB & 3.5mm Headset
Recording device : Dell G7 Windows 10 Laptop via USB
Recording location: Sitting at dining table - no pillowfort but fairly non-reverberant location with soft furnishings and bookshelves. 
Recording app: Audacity for Windows
Recording format: WAV (16 bit stereo)
Sample rate: 44100Hz
Editing app: Audacity
Sound Treatment: Auphonic Productions at Auphonic.com
Auphonic.com settings [to output as a 16bit mono WAV file]: Adaptive Leveler (on), Loudness Normalization (Loudness Target -19 LUFS ), Filtering (on), Noise and Hum Reduction (Reduction Amount: Auto), Sample rate: 44.1kHz
I uploaded the resulting WAV file to Anchor.fm to host the file and added the music from their free music stock.
Anchor automatically converts the WAV file into a 128kbps .m4a file

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