Posted on Leave a comment

Aurora Jupiter Guitar Preamp Build Log: Part I

Jupiter Prea Build Log Front 1

This is something that I have been meaning to get around to doing for a while as this board is the replacement for the original Single Channel valve preamp PCB. Not only that this is testing the Rack Preamp Chassis fit.

I had a day off work today so I got cracking on this. So far all that I have done is plan the overall layout and done the majority of the drilling.

In this preamp I am taking an alternative route to what I did in the first recording preamp. I am not using a traditional transformer. Instead I am using two switch mode power supplies.

From these I can get a regulated 9.1v for the GEQ, DI & Boost and also 280v B+ & 6.3v DC heater supply.

I began exploring this as an option due to being asked to build a Goliath Preamp for use overseas. Rather than having to rewire a transformer before shipping with these the preamp has a universal input voltage from 96-250v with no changes needed at the user end. Just plug it in and go.

Enough waffle here are the progress pictures. I’m quite pleased with how the PCBs turned out I chose this colourscheme to highlight the Soldano SLO Influence.

This is the basic layout. Note the pot? That was put in to ensure I didn’t drill too close to the front for the PCBs
Jupiter Prea Build Log
And here we have both SMPS in at the top right.

That is all for this post but I should hopefully be able to continue these on a semi regular basis over the next few months ending in the preamp being sent off to Matt at Numbskull Audio for a long overdue demo video.