Intonation on Les Paul Standard

[CommonCourtesy]

Trying to get the intonation right on my Epiphone Les Paul Standard. Top 3 strings are alright but whenever I flit between drop d and standard the A and D strings are always sharp/flat after I've turned the 6th string.

E.g If I was in drop d, and go back to standard, the A and D strings will be sharp.

Or if I go to drop d, the A and D strings go flat.

Why is this? Have I not been doing something right?

Help please!

[Dave Sloven]

'60s profile neck?  Sounds like your neck is twisting a little

[CommonCourtesy]

I think so, 2012 model.

All started when trying to diagnose an irritating rattling sound when playing open A and D strings.

Might switch out the bridge for a Gibson model. Never been a fan of the Epiphone factory ones.

[Alex]

I'm guessing the neck is sensitive enough that the change in string pull from the low E makes a big enough difference. Some guitars can be very sensible like that. I had an SG where every little change made a difference, and a Voodoo LesPaul where almost nothing seems to impact a lot.

What gauge are you using?

[CommonCourtesy]

Its not done this before until a few weeks ago. I don't think you can put Gibson hardware on an Epiphone either? Heard about tone-pro bridges though.

using EB Skinny top heavy bottom's, 10-52. This guitar acts as a back up in my band (we play in drop c) and also standard for teaching purposes.

[Dave Sloven]

My SG Junior and SG Standard both have the '60s profile neck and both twist as you tune up.  I tune from low to high and then check the low strings again. 5 and 6 usually need adjustment

The angle of the neck and nut on a Gibson can also cause problems with the G string.  This is very common.  It's more of an overnight thing though.

[CommonCourtesy]

Yeah, I've sorted it out now, turns there were a few issues with the nut and bridge adjustment. I should know better not to tamper with it!