I had a DB750 shipped to me recently and had the opportunity to plug it in yesterday. Turned on fine, seemed super quiet. Former owner told me preamp tubes might've shifted during shipping and causing the quiet-ness. I pop it open and done tube is completely out of its socket, and another bent, and the top circuit board (see pics) seems like its come off its mounts and caused the issues during shipping. No pins from the tubes were stuck in the sockets, thankfully. I could not find a schematic or other gut shots after a cursory search online.
To anyone else with a DB750 - do those posts actually mount to the board or just support it? There are 4 of them. To me it seems like the circuit board is held in by tension, given the two strips of white foam on top of the circuit board would be making contact with the top cover - I find it very unlikely all 4 screws sheared off so the power control board just "floats".
I had some extra/used 12ax7's lying around so I was able to confirm the amp works properly after replacing the two with bent pins this morning - it was a LOT louder and no odd noise issues were detected. I didn't crank it as its still before 10 am where I live.
To anyone else with a DB750 - do those posts actually mount to the board or just support it? There are 4 of them. To me it seems like the circuit board is held in by tension, given the two strips of white foam on top of the circuit board would be making contact with the top cover - I find it very unlikely all 4 screws sheared off so the power control board just "floats".
I had some extra/used 12ax7's lying around so I was able to confirm the amp works properly after replacing the two with bent pins this morning - it was a LOT louder and no odd noise issues were detected. I didn't crank it as its still before 10 am where I live.
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