This is an outstanding passive preamp, made by hand in California, USA.
Functionally, it features 5 inputs plus 2 tape loops. Looks beautiful and sounds totally transparent. This one has the TKD volume potentiometer. It looks nearly perfect to me, but I am not a professional. Feel free to ask any questions.
This is a stunning piece of audio history inside and out. Steve McCormack (the designer) said the Deluxe was designed for “cost no object” performance with high end switches and wiring. See his comments below for the difference between the Deluxe and Standard preamps, and some history.
“The Line Drive series of passive preamps was produced originally by The Mod Squad, which then became the McCormack Audio Corporation. They were built in the California facility between 1984 and 1992. The design evolved over that period, incorporating a variety of different wire, solder, grounding arrangements, volume controls, RCA jacks, and switches…
The Standard and Deluxe models are functionally identical. The difference is in several key parts that were chosen for cost-effective performance in the Standard model and cost-no-object performance in the Deluxe version. The Standard model has a Noble volume control; the Deluxe has a Penny & Giles or TKD (depending on vintage) conductive plastic control. Tiffany RCA jacks were used on both Standard and Deluxe units, but the Deluxe has WBT or Cardas jacks fitted in the CD, AUX 2, and MAIN OUT (1) positions. High-quality copper hook-up wire is used in the Standard model, while higher-performance wire was used throughout the Deluxe unit (again, the specific wire depends on when it was built).