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Weird overtone issue solved...

In the past, I had issues with bizarre out-of-tune overtones on the E string of my Harmony H22... I went through a couple .100 Pyramid Gold E strings from brand new sets, and figured that it must be an issue with the factory, and so I settled on re-using an older .110 Pyramid Gold E string that had some flat spots worn into the wrap from fret wear, but that had no noticeable weird overtones. It was a heavier gauge than their standard E, so I figured that it must have been the extra thickness that muffled or hid any weird overtones that the rejected new replacement E strings had been plagued with.

Anyway, this E string stayed on the bass for years, until breaking at a recent gig. As .110 gauge Pyramid Gold strings are not readily available online for purchase as single strings, and I didn't feel like shelling out $70+ for a whole new set, I ordered a .109 LaBella online, which arrived today. I put it on the bass, and noticed the weird overtone issue again, but super loud. I was super frustrated until I noticed that when unplugged, the overtones were so loud that I could determine their exact direction of origin... which was the afterlength between the bridge and the tailpiece! So I muted the afterlength with the heel of my hand and played the string, and lo and behold the weird sour overtones were gone!!

I have no idea why I didn't figure this issue out years ago... When I first got the bass about a decade ago, I had stuck a piece of foam underneath the strings under the tailpiece to mitigate possible feedback issues, and of course had no issues with weird overtones. And a couple years later when I wanted to change the strings to a newer set of Pyramid Golds, I guess i forgot to put the foam back under there. The A, D and G string afterlengths never really rang out at all while playing, and the heavier E that recently broke was so massive and stiff that the afterlength never rang out either. But those lighter Pyramid E's that I tried out years ago had the issue, and the new LaBella did too, and now I know why. Now I feel bad for rejecting those Pyramid E strings back then, and thinking something was wrong with the manufacturing process. I'm not sure if I still have those rejected .100 Pyramid E strings buried away in my possessions somewhere, but the LaBella is staying on the bass now, as I am used to a thicker gauge (even though the LaBella is lighter in tension and not as fat sounding as the recently broken .110 Pyramid)

Now I just need to find a new piece of foam to stick under the strings again...
 
The repairman in any reputable guitar shop should have a tone of foam pieces from leftover boxes from pickup replacements. He/she would probably give you a handful just to get rid of them.
 
I was super frustrated until I noticed that when unplugged, the overtones were so loud that I could determine their exact direction of origin... which was the afterlength between the bridge and the tailpiece! So I muted the afterlength with the heel of my hand and played the string, and lo and behold the weird sour overtones were gone!!

This phenomenon is well known to players of Gypsy Jazz guitars. They have floating wooden bridges and a brass tailpiece. Many makers and players mount leather between the tailpieces and the tops of their guitars to mute the sympathetic , weird overtones.
 
I think I used a nerf dart... :)
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