3U-13 - Three Rack Space Chassis 13" deep


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Aluminum rack-mount chassis 3U tall (5.25", 133mm) and 13" deep (330mm). Textured black paint, except on the interchangeable front and rear panels which are smooth white and smooth black.

This chassis is ideal for a single or multiple preamp kit(s) plus power supply. For instance, our PSU-PRE preamp power supply mounts horizontally, with the PRE board(s) also mounted horizontally using spacers. Ventilation is good. Use with any of these London Power kits: F-PRE, D-PRE, LP-PRE, M-PRE, S-PRE or Z-PRE, and/or with BFX and LINE.

Our octal power amp kits (PA66-10, PA66-25, PA66-976) and matching supply (PSU-10, PSU-25, PSU-50) will fit in this chassis as a stand-alone single channel power amp. A stereo 10+10W or 25+25W power amp can also be built provided the tubes are external. There is room to add any one of the London Power preamp kits.

Note that where PSU-PRE will support up to six preamp tubes, PSU-10 and PSU-25 will support 2, and PSU-50 will support 42, while providing active hum filtering for the plate supply and a regulated 12V heater/relay supply. If the chassis insert CH-13 is used, there is insufficient height for vertical mounting of the EL-84s or octal power tubes, so construction would be limited to a single channel power amp with/without a preamp.

See our Rack-Mount Chassis page for more information.

About London Power

London Power was founded in 1990 by Kevin O'Connor, after two decades of research into innovative audio amplification techniques. Kevin is an audio designer, author and speaker, known for his proprietary methodology called Power Scaling, and for his eleven books on audio subjects. Whether you seek amps, kits or information, you'll find useful answers here on not just the "how" but the "why" of audio amplifier design. Please enjoy the information on this site, and don't hesitate to contact us with questions.

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(807) 473-0952
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PO Box 10012, Thunder Bay, ON P7B 6T6 CANADA