My friend has an almost new Epi LP that is displaying intonation problems.
The neck relief etc. are all within specs. The scale length should be standard Gibson 24-3/4 inches. It's 12-3/8ths from the inside of the nut to the top of the 12th fret and the same again from their to the "middle" positions on the bridge saddles. 'It tunes just fine and intonates just fine at the 12th. But...
Every string us sharp at the time end of the neck. No matter what he tries it stays sharp. The adjustable nut has been "decked" then raised just high enough to stop the frets touching the 1st fret, so it's not the nut height.
I think it's because he's fitted an adjustable nut that has effectively increased the scale length by 1/8th of an inch. My friend says that's ballcocks. I think I'm right.
To get it to intonate at the 12th, the saddles have to be pretty far back on their adjustments. Therefore the 1/8th extra betweenthe nut and theandthis being compensated for by 1/8th extra between the 12th and the saddles, effectively increasing the scale length by a full quarter inch.
Please help us because theres a cassete tape of The Nolan Sisters Greatest Hits riding on this...
The neck relief etc. are all within specs. The scale length should be standard Gibson 24-3/4 inches. It's 12-3/8ths from the inside of the nut to the top of the 12th fret and the same again from their to the "middle" positions on the bridge saddles. 'It tunes just fine and intonates just fine at the 12th. But...
Every string us sharp at the time end of the neck. No matter what he tries it stays sharp. The adjustable nut has been "decked" then raised just high enough to stop the frets touching the 1st fret, so it's not the nut height.
I think it's because he's fitted an adjustable nut that has effectively increased the scale length by 1/8th of an inch. My friend says that's ballcocks. I think I'm right.
To get it to intonate at the 12th, the saddles have to be pretty far back on their adjustments. Therefore the 1/8th extra betweenthe nut and theandthis being compensated for by 1/8th extra between the 12th and the saddles, effectively increasing the scale length by a full quarter inch.
Please help us because theres a cassete tape of The Nolan Sisters Greatest Hits riding on this...
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