For those of you familiar with the Muffsy Phono Preamp, the connectors on the back panel have to be grounded (using cables) like so:
This is perfectly fine for the high output that an MM cartridge delivers, but it can be a source of noise for the lower MC signals. Here's a solution to that problem:
The RCA connectors and the ground screw will have direct contact with the copper rings around the mounting holes. These copper rings are connected with copper traces beneath the black coating, eliminating the need for separate ground cables.
Here's a look at the other side of the panel, which fits the B0905 cabinet perfectly:
Here it is with connectors, ground screw and power switch: