Who doesn’t love a great decade resistor box? I had bought the cheapest one on amazon. But if you want a Jobe done right, do it yourself.

I designed this Decade unit around 2 PCB’s with .1% SMD resistors for each unit.

Also due to their small size they are much more handy to have around the breadboard and are wired with bread board wires.

I made a video demonstrating the OP AMP Simulator from the great Ray Wilson’s website http://musicfromouterspace.com/index.php?CATPARTNO=&PROJARG=ELECTRONICS%2FTECHBENCH%2FTECHBENCH.php&MAINTAB=SYNTHDIY&SONGID=NONE&VPW=1314&VPH=827

You can order your own from my shared projects with PCBWay

https://www.pcbway.com/project/shareproject/Decade_Resistor_Box_By_RNA_898fa2f0.html