Repair of 1975 Gibson J-45

[Barry Daniels]

And then I discovered this ugly mess. I knew there would be some damage from the previously moved pin holes, but the bridge was resting on a thick bed of glue. It looks like the glue is at least 1/16" thick and thicker in some spots. This is not good. I may have to resort to serious top repairs now. I will see what it looks like after a liberal application of De-Glue Goo.

[Barry Daniels]

Also, here is a frequency spectrum of the guitar with the original bracing. The neck and bridge have been removed. I am no expert on interpretation of these graphs, but the blue line shows the guitar with the soundhole plugged with a foam insert which cancels out the body resonance (110 Hz) and the contribution of the back. The gap between the red and blue line around 230 to 240 Hz is the back's interplay with the top.

I am using a free software program called Room EQ Wizard and a USB microphone to make this plot.