Helo there, my name is Gonzalo, Im from Chile, I own an powerhouse strat and an old 69 vibro champ, I try to play the blues, like SRV and Buddy Guy, but Im not good, Its my first time here, and I need help, my problem is my strat, if I play 6 string over 12 fret its sound like univibe chorus ??, its like if the pick up amplify the wave pattern of vibration. First time i notice was when I replace the original neck pick up with a texas special, and then one day I reinstall the original pick up, I think its king of physic resonance or something like that, I check the amp, I try pluggin direct into a stompbox with earphones, clean sound, and its killing me, its really painful, & string its worst but I can notice the soun on 5 and 4 string, between 12 and 18 fret its like a curst, please if you have any hint, I just cant play it anymore.

Best regards,

Gonzalo

Lower the bass side of your pickups.

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No no and no

I did, but nothing ... I rewired my guitar, tigth the screw, change strings, but I cant fix it

Sounds like pickups being too close to the strings... but if you say you already checked that then i dont know