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1954 Gibson Two-Tone GA-20 AMP - Back Panel Measurements


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I recently picked up an all-original 1954 Gibson two-tone GA-20. The amp is complete, accept it's missing the back panel. I would like to make a replacement, so I was hoping another owner (of this amp or similar model w/the same cabinet) could help, by providing the actual measurements of the rear panel. I would need the overall height of the panel and the L x H of the vent holes and their proximity (measurements) to the side and bottom of the panel. With these measurements, I would like to make a accurate replacement. I would greatly appreciate any information and would be thankful for any help!

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