I did buy something last year on Black Friday, a Fender CC-140SCE guitar, but it had problems and I returned it. After I sent it back I realized that one of the problems it has should be, as far as I can tell, actually impossible and regretted not noticing that earlier so I could have examined it closely to see what the hell was going on.
Here is the seemingly impossible problem. Maybe someone here can figure out how this could happen.
On the first string all the notes were right except at the 13th fret. Here's what you are supposed to get at the 12th-15th frets and what you actually got:
12 13 14 15
E F F# G <-- should be this
E G F# G <-- this is what it actually was
When you play a note you press down the string behind a fret. That is supposed to result in a section of string suspended between the top of that fret and the saddle which is the correct length and tension to play the correct note.
If the fret is too low or another fret between that fret and the saddle is too high the string might end up suspended on a fret closer to the saddle, and so you get the note for that closer fret instead which will be higher.
Here's a diagram showing why I think this should be impossible for it to do what mine was doing [2].
Ignore fret 14 for a moment. For fret 13 to play a G it has to be below the dotted line labeled "G Line".
Now look at fret 14. It plays the correct note, F#. To do so it must be above the G Line.
But then when you play fret 13 the string necessarily has to go above the G Line to get over fret 14, and from there should pass above fret 15. It should play fret 14's note, F#, not fret 15's G.
We should then get on 12-15 E F# F# G.
If fret 14 were low enough for 13 to play G, 14 would have to be below the G Line, and so 14 would also play G, giving is E G G G on 12-15.
In general, no matter what is going on with fret heights, moving one fret closer to the saddle should never result in a lower note, and moving one step away from the saddle should never result in a higher note.
I did buy something last year on Black Friday, a Fender CC-140SCE guitar, but it had problems and I returned it. After I sent it back I realized that one of the problems it has should be, as far as I can tell, actually impossible and regretted not noticing that earlier so I could have examined it closely to see what the hell was going on.
Here is the seemingly impossible problem. Maybe someone here can figure out how this could happen.
On the first string all the notes were right except at the 13th fret. Here's what you are supposed to get at the 12th-15th frets and what you actually got:
When you play a note you press down the string behind a fret. That is supposed to result in a section of string suspended between the top of that fret and the saddle which is the correct length and tension to play the correct note.If the fret is too low or another fret between that fret and the saddle is too high the string might end up suspended on a fret closer to the saddle, and so you get the note for that closer fret instead which will be higher.
Here's a diagram showing why I think this should be impossible for it to do what mine was doing [2].
Ignore fret 14 for a moment. For fret 13 to play a G it has to be below the dotted line labeled "G Line".
Now look at fret 14. It plays the correct note, F#. To do so it must be above the G Line.
But then when you play fret 13 the string necessarily has to go above the G Line to get over fret 14, and from there should pass above fret 15. It should play fret 14's note, F#, not fret 15's G.
We should then get on 12-15 E F# F# G.
If fret 14 were low enough for 13 to play G, 14 would have to be below the G Line, and so 14 would also play G, giving is E G G G on 12-15.
In general, no matter what is going on with fret heights, moving one fret closer to the saddle should never result in a lower note, and moving one step away from the saddle should never result in a higher note.
And thus I'm completely baffled by that guitar.
[1] https://www.amazon.com/dp/B08H1NTK82?th=1
[2] https://imgur.com/gallery/2NLkvgt