Old specification ACA power BOSS OD-1 OverDrive The dual-type NEC C4558C op-amp feels like it has a slightly wider bandwidth and range than the quad-type, and can output its characteristic mid-range and crisp presence not only to tubes but also to transistor-based systems. There is no scratchiness and it works without any problems. Please check the other photos and contact us if you have any questions. aguilar darkglass markbass musicman fender moon kensmith alembic diamond boss roland ehx jhs dod digitech maxon ibanez fernandes greco gibson shin's shi-ei vox tcelectronics klon tim Timmy Vemuram danelectro Please note that we keep serial numbers and internal circuit images to prevent swapping and false claims of missing parts.