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Amp Camp Amp

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Hello EU resident!

Our chassis ships from Italy. Due to VAT regulations, you must purchase your chassis directly from our partner Hifi2000.

When you click the button below, the parts and power supply will be added to your cart here at The diyAudio Store and you will be taken to view your cart. At the same time, another window will open for you to purchase your chassis from Hifi2000.

Description

A Beautiful "Class A" Amplifier Kit

Stereo chassis or monoblocks. Easy to Build. Everything included.
Parts Kit $129 - Power Supply $49 - Chassis $149

Watt's new in the Amp Camp Amp V1.6?

We're excited to announce the latest revision of our most popular and in demand kit of all time, the Amp Camp Amp.

Improvements since V1.5:

  • We have a new "ACA Information Directory" that gives you links to everything you need
  • V1.6 features new and upgraded connectors and switches, including a Neutrik XLR input so you can build balanced monoblocks with twice the power!
  • It's got a new high quality 24V 5A power supply, increasing power from the previous version's 5W up to 8W
    • Comprehensive step-by-step ACA V1.6 build guide hosted at guides.diyaudio.com
    • Just solder a few more wires to turn it into a single-ended or fully balanced monoblock with twice the power of the standard ACA!
    • A front power switch
    • Black or silver front panels, and both blue or red LEDs

    What Exactly is an Amp Camp Amp Anyway?

    The Amp Camp Amp was created by Nelson Pass for a special event called "Amp Camp" in which 20 people built their very first amplifier from start to finish in one afternoon. The event was held outdoors on a lovely sunny day in California and all attendees walked away with a fully functioning amplifier and a smile on their dials.

    Naturally, other people wanted share that same amazing experience of successfully building their first amplifier so diyAudio has created the three essential ingredients you need for that same journey - the parts, the instructions, and the community.

    Read more in the Amp Camp Amp article hosted on diyAudio.

    How does it sound?

    Once you build the Amp Camp Amp you'll never look at power and distortion figures the same way again.

    Each channel is just 8 watts, but they're very good watts. In fact Nelson's DIY endeavors are called "First Watt" because in his own words "The first watt is the most important watt". The amp has enough power for medium to high efficiency speakers at normal listening levels. They sound even better bi-amped with an active crossover.

    •  "Insane amount of detail, deep bass and crystal highs" - Starbender
    •  "Great power, bass and massive detail" - Waam68  
    •  "Highly detailed, yet smooth and sweet" - Mitchba
    •  "I am amazed at the sound quality" - Neoinc
    The Complete Amp Camp Amp Kit

    It's not just a kit, it's an education - here's why everyone is falling in love with the Amp Camp Amp:

    Everything Included
    It can take days of searching and ordering from multiple suppliers to obtain all these parts. We've done that for you. Everything you need is included, other than basic tools.

    Detailed Build Guide
    We've put together an all new detailed build guide for the new ACA complete with step by step photos and instructions so you're never lost. Plus, our friends at TekThing recorded a beautiful 30 minute build-video of how to put together the previous version!

    Quick and Easy to Build
    Even a kid can build it and many have! All you need it one afternoon and you'll have finished and be listening to a beautiful class A stereo amplifier!

    The Amp Camp Amp Kit makes a stereo amplifier that sounds great - here's why


    Designed by an Audio Legend - Nelson Pass
    Nelson's company Pass Labs makes some of the finest (and most expensive) amplifiers in the world. This amplifier has its roots in decades of award winning amplifier design experience.

    Minimalist Amplifier Topology
    Less is more. Nelson is famous for his "Zen" approach to design and this amp is no exception - it's a minimalist circuit that delivers purity through simplicity.


    A Pure "Class A" Design
    Most amplifier designs switch transistors on and off causing noise. Class A amplifiers are always operating in their sweet spot, which is why people say they sound "silky smooth".

    Save Time and Money


    You could spend days or weeks trying to find the right parts, then paying over and over for shipping from multiple suppliers. Or you could buy the Amp Camp Amp kit!

    So Simple You'll (Actually) Finish It

    We've got you covered with easy to follow step-by-step visual Amp Camp Amp Build Guide. There's also an amazing build-video of an earlier ACA version from TekThing showing construction from start to finish!

    Benefit From New Skills

    Don't sit on the sidelines - get building today! You'll learn new skills you can apply to other projects, refine your ear and duly feel pride in your accomplishment.

    Enjoy Quality Sound

    If you want to hear the sound of one transistor clapping this is the ticket. Dead silent, pure and luxurious. Reviews speak for themselves: "Insane detail", "deep bass", "crystal highs", "great power", "fluid", "sharp", "smooth", "sweet".

    Relax Knowing This Is a Great Choice

    The Amp Camp Amp Kit sounds like a much more expensive amplifier, is quick and easy to build, simple to understand, includes all the parts, comes with instructions, and has a wealth of support if you need it. You can't go wrong with this tried and tested project.

    Meet Other Audiophile Makers

    As you breathe life into these amps, they'll literally breathe it back to you! Be a part of the super friendly Amp Camp Amp maker community on diyAudio and meet other makers that share your obsession with quality sound.

     

    A step-by-step build guide and pit crew standing by

    We've just launched "diyAudio Guides" (beta), a brand new place to find and share knowledge about audio DIY. The Amp Camp Amp Build Guide is now more accessible than ever. Follow step-by-step on your phone or tablet while you're actually building the amp or printed the guide as a PDF - it's never been easier to complete your Amp Camp Amp in one sitting!

    If you need more help, there's hundreds of diyAudio members who consider it their mission to help any ACA builder get their first amplifier build completed. No question is a stupid question in the ACA thread, so join in the discussion and meet other first time and veteran builders in the Amp Camp Amp discussion thread.


    The Complete Amp Camp Amp Kit

    Watch TekThing build the ACA

    TekThing is an awesome video blog for technology geeks. In this 30 minute video Patrick Norton talks about the history of the Amp Camp Amp, and then builds a channel from start to finish! If you like the video consider subscribing to the TekThing YouTube channel for regular geekery or become a patron and get perks! Please note that in this video Patrick applies the Keratherm incorrectly - you need to peel off the backing before applying it!

    What's In The Complete Kit?

    1. The Parts Kit

    Components

    • High quality genuine parts purchased directly from "Tier 1" US distributors such as Mouser and Digikey
    • Printed circuit boards (Revision 1.6)
    • Transistors including Linear Systems LSK170 JFETs and IRC MOSFETs
    • Switches, LEDs, capacitors, resistors, we include everything 
    • The same parts quality that Nelson Pass uses in his own amplifiers

    Hardware

    • Components purchased either from "Tier 1" distributors or do-it-yourself audio favorites like Parts Express 
    • Keratherm® MOSFET insulators - very efficient and no grease required
    • M3 board mounting standoffs, w/ stainless steel bolts and washers 
    • Stainless steel mounting bolts and washers for MOSFETs
    • Gold plated speaker terminals and RCA Jacks
    • Power connector jack
    • Copper hookup wire in assorted colors
    • Cover plate for XLR hole (for advanced users, the XLR hole gives the possibility to create monoblocks with 15 watts per channel)

    2. The Power Supply

    • From Meanwell, the best known producer of high quality SMPS in the world
    • The power supply is universal and operates from 86-264VAC and 47-63HZ
    • It comes from a best-of-breed manufacturer, has less noise, more power and weighs more than twice as much as the previous power supply
    • You can read more about it on the Meanwell 24V 5A power supply page
    • This new power supply is also a suitable upgrade for all previous Amp Camp Amps, just plug and play (see notes here)
    • This power supply is Nelson's lab tested recommendation, but to save money you can BYO 19V or 24V 5A laptop style power supply. YMMV!
    • It has a generic 3 prong IEC 60320/C13 power cord inlet suitable for use with a "kettle cord"
    • We ship it with a Linvox 3271V86 6 foot cord that has a US 3 prong plug. If that plug doesn't work for you, you can use a plug adapter, or "borrow" an IEC cord from your least favorite piece of equipment.

    3. The Chassis

    • From the Italian chassis artisans at Hi-Fi 2000
    • Custom design for the ACA / ACA parts kit
    • Ships direct to you from Italy with FedEx International
    • All the work done is for you - just screw it together!
    • 10mm aluminum front panels drilled (dual LED holes), anodized and silkscreened with hole for a front power switch
    • 3mm aluminum rear panels drilled (power jack, RCA input, speaker output, power switch and XLR expansion module hole) and anodized
    • 40mm aluminum heatsinks pre-drilled and pre-tapped with M3 threads for easy mounting of circuit boards

    If you bought each part yourself

    • Bolt Depot (Bolts) - $7.71
    • Digikey (Small electronic components) - $42.43
    • diyAudio Store (Keratherm, Transistors, PCBs) - $71.89
    • Mouser (Power Supply and power cable) - $62.33
    • Parts Express (Mounting hardware, wire, etc) - $57.18
    • Customized chassis - over $200, more likely $300 including heatsink tapping
    • Total: $441.54, plus a day hunting for parts and a day drilling your chassis and tapping your heatsinks

    Save money, and time

    To assemble this same kit yourself would cost over $440 including parts, hardware, sales tax and shipping. And you wouldn't get the tapped holes or front and rear panels drilled. And then there's your time in buying all the parts and working the chassis...


      * All prices were calculated live on 11 June 2016 using real products and a shipping address of San Francisco, some prices updated May 4th 2018

       

      Technical Specifications

      Frequency response 10 - 20 kHz +/- 0.1 dB
      Power (stereo) 8W into 8 Ohms per channel
      Power (monoblock) 15W into 8 Ohms per channel. See ACA operation modes for details on monoblock operation.
      Power Measurement Measured at clipping with 3% distortion
      Distortion 0.7% at 1 Watt (primarily second order harmonic which being even-order is described as "sweet, tubey" and being low-order as "benign/inaudible")
      Input impedance 10 Kohm
      Max Gain 14dB
      Damping factor 10
      Output noise 100 uV
      Power supply input Universal 86-264VAC 47-63HZ
      Power supply output 24V 5A
      Heat dissipation 20 Watts per Channel

      Power

      Ω Ch. Config. Conn. Supply Power
      4 2 Single-ended stereo RCA 19V 5W
      4 2 Single-ended stereo RCA 24V 5W
      8 2 Single-ended stereo RCA 19V 5W
      8 2 Single-ended stereo RCA 24V 8W
      8 1 Balanced monoblock XLR 19V 15W
      8 1 Balanced monoblock XLR 24V 15W
      16 1 Balanced monoblock XLR 19V 10W
      16 1 Balanced monoblock XLR 24V 15W

      More specifications found in the original ACA V1.0 article, and power and distortion graphs are hereSee ACA operation modes for more details on monoblock operation.

      Speaker Recommendations

      The ACA is a minimalist, low power amp that's easy to build and the perfect choice for your first amp building project. It's the "fixie bike" of Class A amplifiers; no gears, no brakes; zen and the art of amplifier maintenance.

      It likes efficient speakers that present an easy load to the amplifier. The right pairing will give you great sound full of audiophile buzz-words, and more than adequate volume for everyday listening or to annoy your neighbours (8W with 91db speakers gives 93db at the couch). Double the power per channel with monoblocks.

      If you have a particular pair of speakers in mind, ask about them in the ACA discussion thread.

      You're In Good Company

      The Amp Camp Amp Kit has received coverage in these publications

       

       

      The reviews speak for themselves

      "Insane amount of detail, deep bass and crystal highs! Tried few old restored amps with 4000M's, ACA's are perfect match so far. So, thanks Mr.Pass for this eye-opening experience..."

      Starbender
      diyAudio Member
      "I have it my office and it blows away the Yamaha AV receiver I have been using (until today). I am very surprised by the difference. Definition and sound stage are so much better. This with low end bookshelf speakers...I am hooked!"

      Bnorrish
      diyAudio Member
      "The amp sounds great....great power, bass and massive detail...Amazing amp for the build cost. The amp is dead silent between tracks."

      Waam68
      diyAudio Member

       

      "I am using 4 x ACA's kits to drive 8 ohm Selenium D405 midrange and BMS 4540 high frequency compression drivers in a Digital XO tri-amp set up... I am impressed with the sound quality - highly detailed, yet smooth and sweet."

      Mitchba
      diyAudio Member
      "Amps go together so easily! Really a great initiation!...absolutely massive, dense, fluid, sharp as a knife sound. Played a few tracks I'm familiar with and the hairs on the back of my head nearly lifted me off the floor!!"

      JKRO

      diyAudio Member
      "Spent 2 nights assembling the kit and volia now it is singing. Source is a old niam cd2 > BA3 FE > ACA > Markaudio Alpair 6 floorstander. I am amazed by the sound quality. Once again, thank you Papa Pass."

      Neoinc
      diyAudio Member

       

      This is the Best "First" Amplifier Kit You Can Buy

      A beautiful class A amplifier design from the master of the art with all the parts, instructions and help you need.

       

       

       

      Customer Reviews

      Based on 148 reviews
      94%
      (139)
      6%
      (9)
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      J
      J.
      First ever amp build, interested in Pass class A design since 1987, this kit is great

      Kit shipped earlier than expected following my pre-order (thanks!) and was in smaller boxes than I expected (cool!). I spent time studying the forum and videos on YouTube. Also took most of the advice I read including getting the proper tools for the job based on the list in the build guide, which is very good. I took my time on the build having never done one before. Spent a lot of time laying out the parts at each step, and was definitely patient with my novice soldering skills. End of build story - amp powered up perfectly first try, and I've been watching the bias adjustment as it stabilizes at normal class A operating temps. It sounds wonderful on my simple shop speakers. The sound reminds me very much of when I first heard a Soundstream Class A 40 in 1987 (my introduction to Nelson Pass design and class A amplification). The real test will come later when I hook it in to a tri-amp setup, where it will handle 450Hz and up, alongside a First Watt M2.

      The kit with associated documentation and support was terrific overall. I feel like I have a chance of undertaking a more complicated build in the future. Thanks to NP and the crew at diyaudio. Time lapse vids of this build are posted, also the first power-up minutes, search "4thgc racer amp camp amp 1.6" on the goog machine. Total build time ~8 hours not including study time, majority of that was fiddling with chassis dry fit and order of operations for the wiring and final assembly. I added eight small washers to make things align comfortably - four at the nuts holding the rear panel on, and four between the mounting rails and the face plate as I was having trouble getting the heat sinks square to the faceplate without forcing it.

      p
      p.j.
      Fantastic little amp !

      Soldering the 4 boards (2×stereo setup) was about 2 hours. Building the chassis was a couple of evenings. I built them with a twist, i used linear powersupplies. 1 transformer for each board, and a dual CRC board. And they have plenty of power for my Lowther 8" in a FLH JMLC 200 horn (about 106 dB or so efficency). Do i like the sound (?) - I just ordered the Aleph J boards...

      M
      M.B.
      I'm so lazy...

      Of course I'm joking. Had not time to start putting everything together since I received my parcel 3 months ago. Yesterday I begun, and today I've almost finished (about 4 hrs total time).
      Nothing to object for what concerns the electronics.
      Cabling: it is not clear which wire diameter has to be used, can be confusing for novices.
      Mechanical: I will replace the cruciform-drive screws holding the guides to the heatsink and the heatsink itself to the front panel with Allen screws, or Torx (haven't check in my drawers yet).

      Hopefully, I'll listen to my brand new ACA in a couple of days

      J
      J.M.
      Better than expected...

      The assembly was easy due to the good instructions.
      The PCB assembly is simple,
      the assembly in the small case is a bit fiddly.

      I have built 2 monoblocks, the connection panel
      I reduced accordingly.
      The switch on the rear panel switches between RCA- and XLR-inputs.

      I increased the series resistor (R13) for the LED from 10KOhm to 1MOhm,
      the LED was way too bright for me.

      I have a timer-relais built in,
      because the amplifier made noises when switching on and off (output capacitor charge).
      When powering up, the amplifier will now initially run on a 10 ohm load resistor,
      after approx. 30 seconds, the speakers switch over.
      The noises when switching on / off are thereby minimized.

      Sonically, I was very positively surprised, I did not expect much.
      All the more I am pleased about the very good sound result.

      Greetings from good old Germany

      R
      R.B.
      Bye bye T-Amp, Bye bye 300B

      After some initial problems with the build (my clumsiness and lack of soldering talent), I finished my ACA today. Very happy with the sound - clean and detailed and very natural. In contrast with the Trends T- amp, its a no brainer. I don't think I can be bothered getting my 300B fixed after the ACA. Great parts quality and the recent new build guide are top notch for novices like myself - highly recommended. Whats next - crossover or M2 ?


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