Re: Third string out of tune below the fifth fret
Show us a close-up pic of the saddle.
I have an OM with the same problem, and the bridge wasn't made for a wound A string.
And even with a PS A the compensation is still off for the strings I am using.
So I am having a custom bridge made, but first have to discover proper compensation.
This thread (where I discovered a way to find correct compensation) may help:
https://www.mandolincafe.com/forum/t...n-tool-perhaps
Also, I think you are right that if the action is too high for that string, that will also cause it to go sharp up the neck.
So you need a properly adjusted and compensated bridge (for the strings you are using) to fix the issue.
Davey Stuart tenor guitar (based on his 18" mandola design).
Eastman MD-604SB with Grover 309 tuners.
Eastwood 4 string electric mandostang, 2x Airline e-mandola (4-string) one strung as an e-OM.
DSP's: Helix HX Stomp, various Zooms.
Amps: THR-10, Sony XB-20.
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