These kits go well beyond the level of "good product" and are truly a point of pride for the people behind them. Even though the kits have evolved, I felt it is still valuable to post about my 1st generation build the quality of the kit is absolutely uncompromising making the finished product quite timeless. Currently, the floor box power supply and a dual power supply which incorporates two complete power supply PCB's in a single 2U rack enclosure are available for purchase. Orders outside of North America are handled by sending email to. Jeff also supplies the 11 space 511 rack kit to North America. Jeff Steiger from Classic Audio Products is the North America distributor for the current floor-box type power supply kit. While the power supply circuit and onboard electronic components have remained the same, the form factor and layout of the power supplies have evolved since my builds. My build is a 1st generation GroupDIY 51X Alliance complete kit with its 2U rack mount power supply.
For my part, I simply happened to be exploring the idea of DIY while the rack kit, power supply, power transformer details were being finalized by capable 51X Alliance members in Germany, UK, and the United States. In the wake the successful launch of this standard within the DIY community, a slew of new designs and kits have emerged. The 11 space GroupDIY 511 rack is in its 4th production run, and there are now over 300 units in operation around the world. It also allows for devices from Forsell, John Hardy, and APP Studio to utilize the higher power +/- 24V rails. This innovative feature allows for the easy design and development of modules that natively run on +24V like NEVE, Neumann, and Telefunken based circuits. At the heart of the 51X standard is the use of an 18 pin edge connector that allows the top 15 pins to remain identical to the 500 series cards and retain full compatibility but the bottom 3 pins allow for the addition of +/- 24V power rails.
The original API 500 series rack utilizes a 15 pin edge connector and supplies +/- 16V power rails as well as +48V phantom power. The GroupDIY 51X Alliance is a collaborative, cross-continental effort within the DIY audio community to produce a new standard that is compatible with the popular API 500 series card format but adds some cool features to support a broader range of designs.
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