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Poorly bass

I think Shoyu was referencing playing the musical Rent, and the "evil" part being discussed might be this one...



For what it's worth, it's one that's been on my iPod since I got it, and I must sing along every time I hear it.


It is indeed the bass part for this musical that is evil! Eta - not all numbers but yes, “Sante Fe” is likely to claim a finger before the end of the run!

The top two strings are the worst offenders with the intonation being about quarter of a tone out at the 12th fret and almost a semitone out at the top. The A string is better and the E is pretty much in tune.

I don’t think it’s been knocked or dropped (certainly not by me) but I suppose there’s always the chance someone bumped it in the pit.
 
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Hello Shoyu,

Did you check the nut position? If you have not touched the saddles, and the bass suddenly lost intonation, to the extent that you describe, I might first check that the nut has not come loose and shifted to an angled position whereby the scale length has increased, especially on the G.

This may occur when restringing the bass, or when tuning up the bass after loosening them for storage, and re-tightening. If you start by tightening On the G (G > D > A > E), a loose nut may initially slip back or tilt back towards the headstock on the first string you bring to tension, thereby throwing off your intonation across the fretboard. (or it might have been knocked at just the right spot to move the nut.)

The SGC Nanyo Bass Collection basses are indeed Japanese made (I think they made some Korean ones in the mid-90's before they sold off the brand). They set up very well and are great players. Good luck getting this sorted out!
 
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Trying to think of things that can cause "suddenly dreadful intonation". There aren't a lot of things that could suddenly change to do that (all strings suddenly have bad intonation? Or just one string?). Are you sure the intonation was good before and then suddenly changed? Or are you just now starting to play high up on the neck? Anyway, here are the things I can think of that could cause intonation to suddenly go wonky:

Bad strings (You said you changed the strings already so not this)

Bridge saddle screw come loose and change position? (you said you adjusted the saddles - are you sure you did it right?)

Did one or more pickups adjustment screw pop loose and pickup height is too close to strings? (magnets pull the strings affecting intonation)

Did the neck angle change so strings are very high?