# data[].attributes.headline
Using 5-pin DIN jacks to power 51x racks

# data[].attributes.subject
Using 5-pin DIN jacks to power 51x racks

# data[].attributes.body
A rugged, cost-effective connector for externally powered devices, pioneered by the BSA™ for studio gear.

This Rean jack withstands >1000 connection cycles, has silver-plated contacts, is rated for 2A, and costs 66¢. Normally employed for dual channel preamps and compressors, it's capable of delivering current to a modest number of 51x racks.

# data[].attributes.body
Male XLR at receiving end (rack,) Female XLR at power supply.

# data[].attributes.headline
The 11-space rack bundle: $364.28 in North America

# data[].attributes.subject
The 11-space rack bundle: $364.28 in North America

# data[].attributes.body
From ClassicAPI.com: http://goo.gl/U2yiq

Customers in other territories must purchase through authorized distributors.  Find yours: http://goo.gl/NdNnl

Get on it. Supplies from the 3rd production run are dwindling. (A 4th run is unlikely anytime in the near future.)

# data[].attributes.body
A detailed build pictorial from a first-time DIY-er.

Pei-Chung's build thread at Studio 939: http://goo.gl/eurqK

Ian French also contributes some graphic details: http://goo.gl/IfdsR

# data[].attributes.body
The venerated zener limiter from EMI.

Info page at DIYRE: http://goo.gl/O6Ih5

# data[].attributes.body
Possibly the best kept secret in preamp design. 51x-only. Build thread: http://goo.gl/fiV5A

# data[].attributes.headline
Salute the few, the proud, the 51x-required.

# data[].attributes.subject
Salute the few, the proud, the 51x-required.

# data[].attributes.body
These few forward-thinking, uncompromising products are 51x-required, not just 51x-compatible.

# data[].attributes.body
Germainum, German, transformer-coupled, with DI, no longer available. Build thread: http://goo.gl/6J0dm

# data[].attributes.body
Mechanical view with measurements and notch dimensions.

# data[].attributes.body
Build it yourself. Powers 11 modules. Lab thread: http://goo.gl/NdNnl

# data[].attributes.attachment_link.readable_text
The 511 is a DIY rackmount chassis in the style of the API 500-series racks. The 511 fits 11 spaces in 3RU with an external power supply. The 51x power supply provides the VPR standard +48v and +/-16v as well as +/-24v power rails for Neve, John Hardy circuits, etc. 511 racks do accommodate standard API 500-series modules.

Images courtesy of [silent:arts] and Hairball Audio
Notable Features:

18-pin card edge connectors deliver +/-16v or +/-24v power rails

Fits 11 single-space modules

Dedicated 2RU chassis for power supply

Power rails provide 1.5A of current each

Compatible with all 500-series modules

Price:

$320 for rack kit

$31 for power connector set

$30 for power supply PCB

$57 for toroidal power transformer

$185 for 2RU power supply case and front panel

$45 for heatsink kit

$94 for electrical wiring bundle

$115 for power supply components bundle

Adjusted Cost: $877

Since the power supply parts are offered separately, builders are free to source their own rack cases, electronic components, heatsinks, etc. and may save some money doing so. Adding up all of the offerings above, however, we get an adjusted price of $877.
More Information:

# data[].attributes.attachment_link.description
The 511 is a DIY rackmount chassis in the style of the API 500-series racks. The 511 fits 11 spaces in 3RU with an external power supply. The 51x power supply provides the VPR standard +48v and +/-16v as well as +/-24v power rails for Neve, John Hardy circuits, etc.

# data[].attributes.body
More brilliance from Igor...

IJ Research on Facebook

http://goo.gl/Ygjqy

Download documentation

http://goo.gl/REaOe

Official build thread at GroupDIY: Mm. Why Not! Microrack!

http://goo.gl/ij2cZ

# data[].attributes.headline
Machine screws for racking modules are 4-40 thread

# data[].attributes.subject
Machine screws for racking modules are 4-40 thread

# data[].attributes.body
Ideally with an "oval head" and a length of 3/8".

Available from Classic API : http://goo.gl/wtLSy

Available from Redco: http://goo.gl/hEfTj

Thumb-screw style from Mouser: http://goo.gl/lppk0

# data[].attributes.body
Pin assignments for 51x, the new standard in modular audio gear, plus its legendary outdated parent.