73P Class-A Mic Preamp

The 73P is an authentic, complete adaptation of the vintage 1073®* mic preamp circuitry to the 500-series format. The 73P is authentic in that it uses only components that are hand-selected to match the original, and there are no changes to any of the preamp circuitry. The 73P is complete in that it adheres to the original, three-stage amplifier design. The 73P is an intermediate DIY kit. To successfully build it, you should have some experience identifying basic components such as resistors and capacitors and soldering on circuit boards. We don't recommend the 73P as your first DIY project ever—check out our beginner kits first. Check the Required Tools list below to make sure you have everything you need to build the 73P before ordering. The definitive kit Our guiding principle in designing the 73P was to get everything right. Every choice, from the use of Carnhill transformers to the hue of the front panel, was carefully considered and tested against the original. The 73P even fea