Amp Camp Amp Chassis (PRE-ORDER SHIPS SEPTEMBER 7TH)
V1.8 chassis has two new features:
- New V1.8 rear panel silkscreen diagram clearly showing how to select all 4 modes (1 stereo, 3 mono) and how to wire inputs and outputs
- Improved more secure cover mounting system using weld nuts and hex head screws
Available in silver or back front panels, with with or without a front panel power switch cutout. The ACA parts kit does include a rear DPDT toggle switch which could be used as a rear power switch if you didn't want to use it for any other function (bridge mode switching, LED dimming, etc), or of course just DIY. The rear panel and covers are intentionally made of easy to work aluminum so that it's easy to mod, however you want to mod it!
This design is based on the 2U Mini Dissipante, which has an internal space of 230mm wide and 200mm deep (heatsinks). You can find more information and specifications on the 2U Mini Dissipante product information page.
- Heatsinks: 2 x 2U UMS heatsinks with the new 2U UMS 8 hole pattern drilled and tapped with M3 threads
- Covers: 3mm black anodized aluminum
- Front panel: 10mm silver aluminum, with
- 2 recessed LED cutouts, 3mm in front, 6mm blind recess in rear
- "Pass ACA Class A Amplifier" silkscreen
- Front power switch hole:
- 20mm dia hole in front, 22mm blind recess in rear
- Compatible with 19mm "vandal proof" switches with 22mm bezel should you want to "pimp your chassis"
- Rear panel: 3mm black anodized aluminum, with the following cutouts:
- 2 RCAs
- 2 pairs of speaker binding posts
- 1 11mm dia DC input
- 1 6.4mm dia power toggle / option switch
- 1 Neutrik D-Series XLR pattern
- Shipping not included, but is very economical
- V1.5 March 2018
- First revision of chassis
- Added front power switch
- Rear DC jack hole enlarged from 8mm to 11mm
- Rear toggle switch hole enlarged from 6mm to 6.4mm
- V1.8 June 2020
- Rear panel silkscreened with mono/stereo connection information to match the 3 way selector switch in the V1.8 parts kit
I was floored upon hearing the amp just after biasing both channels. Never thought I can get this kind of sound from a diy kit. It was Sonic purity at its simplest!
I bought the kit toward the end of summer 2019, built it during the fall. Building the amp was great fun. The instructions were easy to follow. Sounds great with an inexpensive passive preamp (Bellari) and a PAS-3 as my phono preamp. My only reservation is power consumption. I was surprised to see it drawing 90 watts for just 8 watts/channel of output. I suppose that's the nature of Class-A design. And 90 watts is much better than the 190 my old amp was using.
This project was my first amp kit. It went really well. All parts were there and working. Online instructions were easy to follow with ample photos and explanation. Just need some tools aside from the kit. Everything came pretty quickly, even the case from Italy. The amp actually works, and sounds good!
Wonderful and easy to build amp kit. Great build videos and easy to understand builds instructions. Parts quality is very high...and the sound? Well, the sound is amazing. It drove my Tekton Double Impact with ease. My only wish would be to have a higher 4 ohm output rating. Highly recommended.
Bought and built amp to prove Paul Klipsch theory that all he needs is a good 5 watt amp to drive his Klipschorns. This Nelson amp is fantastic, does the job be yond expectation. Is a great addition to my home built F5 amp and Harmon Kardon Citation II refurbished amp. All three sound great. Are using amp as we write this review. Nice kit build. Questioned the solid wire and suggested that the transistors be labeled better for identification. Another great Nelson Pass low power amp.
This is the first DIY amp I've built (well, first 2 actually, since I bought 2 kits). This package, with all needed parts, a well built chassis, labeled PCB, and clear step-by-step instructions, is a good confidence builder. For example, while I have soldered before, I had never soldered anything to a through-hole board (that will be immediately obvious in my pic below). This was a good opportunity to learn a little and work on that skill.
The amps fired right up, and look great. The chassis is especially nice, considering the price. Sound-wise, they are not bad at all, and capture a nice bit of the single-ended class A "magic". I am quite impressed by the flexibility (stereo vs mono, RC and XLR input) and have experimented with all 4 operation modes. Each sounds a bit different and none are perfect, but the sound far, FAR exceeds what it should at this price range and a hack like me doing assembly. To me, this was the perfect price point/time investment to sample solid state class A and learn a bit about how amps work at the same time.
Very nicely finished chassis, with enough room inside to add some modifications to the stock ACA kit. Photo attached shows chassis with ClarityCap MR coupling caps and Audio Note electrolytics, bypassed with small-value ClarityCap MR.
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