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PASS DIY Headphone Amp - WHAMMY

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  1. JamieMcC
    lol Tom that was quick.

    Use my pics for the orientation, I scratched my head for a while over which way to plug it in as there are no markings on it or info in the listing. Luckily I noticed the dual version needed for the whammy is just two singles fitted to an adapter board and in the single version listing there is a helpful pin out.
    Paladin79 likes this.
  2. Allanmarcus
    Ok, this think looks like a transformer or something. Optimus prime of op amps!

    Any comparisons to other op amps? All I have now is an RC4580, but I’ll be trying an Lm833 and ad823 at some point
  3. JamieMcC
    The first op amp I used was the LM833 which I liked and happily used it for a while before picking up a Burson V6 Classic to try. I have pretty much stuck with the Classic ever since it just seems a nice match with the hd800 headphones.

    I did try a Burson V6 Vivid and I can see that being a good choice for more laid back cans but not such a good choice with the hd800.

    The Chinese HDAM clone op amp has definitely improved already while listening this evening at the moment it sounds to me sort of half way between the V6 Vivid and the V6 Classic it sounds spacious and detailed like the Vivid but it is more relaxed but not so intimate and textured as the Classic. Its an enjoyable listen with the hd800.

    But early days maybe if the Burson V6's are anything to go by I felt they took a good while (month or two) of use before I felt I had gotten the best out of them.
    Allanmarcus likes this.
  4. bagwell359
    Nice thread. Owned a few Pass amps and pre-amps, and built a large number of kits in the "old days" - Tiger, Dyna, Hafler, Heathkit... Looks like its time to build a NP design. ACA looks killer!
    JamieMcC likes this.
  5. imran27
    There is this new opamp making a lot of chatter in other places


    Also, OPA1662 has a really nice presentation of sound, very good bass and overall clean and detailed.
    Allanmarcus and JamieMcC like this.
  6. Goldvein
    I'm thinking of doing one of these amp kits, but i have absolutely no experience in soldering or putting things together.
    Would it be possible for me to put this one together, or would i just mess it up and waste 200$?
  7. dweekie
    I haven't built this yet (I don't know why I keep delaying the inevitable but I keep following the WHAMMY threads), but I taught myself soldering using various amp kits in the past. The through-hole pcb design makes it very beginner friendly. The build guide and full kit available from diyaudio give you the foundation. If you watch youtube videos on proper soldering/ de-soldering through-hole components and practice on a blank through-hole board to get used to the process and temperature settings, you should be okay.

    Honestly, the main determining factor of success is your attitude and persistence instead of giving up when you run into problems. When you succeed though, you will be addicted to building all sorts of things.
  8. JamieMcC
    looking on ebay there are loads of inexpensive practice / learn to solder projects like the ones in the link below.
    There are also some clones of the Pass ACA which is a 5W Class A power amp this little amp sounds great and you would be able to use the whammy as a pre-amp driving it.

    Imagine that a full Pass pre and mono block set up.




  9. Goldvein

    Thank you for the answers. It looks like a good idea to get some training kits first. Seems very possible though. I think I’m going to try. Maybe I’ll have some more questions in the future
  10. ThermalAlchemy
    I just completed the Nelson Pass amp camp amp kits duel mono blocks, built a linear power supplies from the PCB boards available at do it yourself audio store. Absolutely awesome little amplifier . I built BK-20 speaker cabinet design for a single full range Fostex speaker. Just crank out 1 W of power for a speaker to put out 96db,
  11. bagwell359
    Very interesting. I need to make a list of Pass DIY amps that can have a 4 pin output and XLR inputs. Not that many.
  12. JamieMcC
    fwiw so far for driving my Hifiman HE-6 the little Pass ACA proved excellent. I have built two ACA so far on the first one I used an adapter from the ACA speaker taps. On the second I fitted a 4pin XLR out (just linked to the speaker taps internally).
  13. GimmeCans
    Does this (WHAMMY) 'play nice' with sensitive IEMs like Etymotics? The 'pitch' implies that it will work with 'anything' but I mean with acceptable noise levels and usable volume control range. I know it will work fine with my 250Ω Beyers but I need to use IEMs at certain times.
    Looks like an easy build save for the absence of a ready-made chassis solution; any suggestions there?.
    Last edited: Jun 22, 2019
  14. Allanmarcus
    No, not good with sensitive stuff
    Luckbad likes this.
  15. GimmeCans
    The write-up describes a way to adjust the gain but I lack the engineering know-how to do it, plus without switchable gain this would be a one trick pony
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