DIY AD797 Phono Stage

Discussion in 'All Things Analog' started by HypnoToad, May 18, 2016.

  1. Thermionics

    Thermionics Post Whore In Training

    FYI - per Sachin there has been a manufacturing delay from the etcher on the latest run of v4 HQMC boards. ETA for them to ship from the etcher is 4/20, so plan accordingly.

    -D
     
  2. sachu888

    sachu888 Junior Member

    Received new batch of PCBs, thanks for patience.

    Regards
    Sachin
     
    airdronian and Thermionics like this.
  3. Thermionics

    Thermionics Post Whore In Training

    Thanks for the heads-up, Sachin. Looking forward to my build.

    -D
     
  4. airdronian

    airdronian Junior Member

    Just working with the BOM's that Sachin sent. Just want to confirm the OPA 134 is a suitable sub for the LME 49990's. Link below....

    https://ca.mouser.com/ProductDetail...zvdnUTOb05Pb6ILsd0IkF4o1ptEw14ORoCNnQQAvD_BwE
     
  5. Thermionics

    Thermionics Post Whore In Training

    Per the original thread on AK: http://www.audiokarma.org/forums/in...hono-stage-build-and-help-desk-thread.501186/

    Which sounds as-if the OPA 134 is not recommended.

    -D
     
  6. sachu888

    sachu888 Junior Member

    You can get the LME49990 from Partsconnexion as you are based in Canada http://www.partsconnexion.com/cgi-bin/sc/productsearch.cgi

    Regards
    Sachin
     
  7. airdronian

    airdronian Junior Member

    Good to know, thanks for that.
     
  8. Thermionics

    Thermionics Post Whore In Training

  9. Prime Minister

    Prime Minister Site Owner Staff Member

    My order is in! Help will be needed! :)
     
  10. HypnoToad

    HypnoToad Junior Member

    As already mentioned the OPA134 is the single circuit version of the old faithful OPA2134, the OPA134 will work but wouldn't be near the top of my list, too laid back an too narrow soundstage for me, the OPA1611AIDR which are cheap but need to be mounted on a SMD to DIP 8 Adapter would probably be a better choice IMHO YMMV.

    Another option is a pair of OPA627's (OPA637's won't work) or a pair of the Burson V5i single which are both expensive. (No Affiliation)
     
    sachu888 likes this.
  11. Prime Minister

    Prime Minister Site Owner Staff Member

    So what would I need to do to get the absolute best out of this. Cost no object.
     
  12. HypnoToad

    HypnoToad Junior Member

    I am using the Burson V5i's in the second stage, there is a newer one that's the V6 which is supposed (according to Burson and a few reviews I have read) even better.

    https://www.head-fi.org/showcase/burson-audio-supreme-sound-opamp-v6-vivid.22718/reviews

    Stick with the AD797BRZ on adapters for the first stage, nothing beats them in this circuit IMHO.

    You can go as high as you like with the DC blocking caps to your bank managers delight, I use the old faithful Russian K73-16's but others have gone for the boutique ones, the 2.2uf Mundorf Mcap Supreme gets great reviews and "only" costs around $45.00 per pair, you can go up to the 2.2uf Mundorf Mcap Supreme "Silver Oil" for example which costs around $150.00 per pair and it doesn't end there. Caps are like speaker cables IMO, you can pay a fortune and have to decide yourself if they are worth the extra money. Others may chime in with their choices for the DC blocking caps.

    You could also get some LCR Polystyrene 1% caps to use in the RIAA stage these would be 2 x 15,000pf's 63v and 2 x 4,700pf's 63v, you can get them from Newark / Element 14 for around $3.00 each.

    That's about it AFAIK.
     
    Last edited: Apr 30, 2018
    sachu888 likes this.
  13. sachu888

    sachu888 Junior Member

    Any new builds?

    Regards
    Sachin
     
    Thermionics likes this.
  14. airdronian

    airdronian Junior Member

    Not here unfortunately. I'll have to postpone anything else on it for the time being.
     
  15. TubeHiFiNut

    TubeHiFiNut Administrator Staff Member

    I would love to try one of these but 1. I'd rather chew on nails than solder and 2. do not have the physical dexterity in my hands to solder on boards - or even P2P, for that matter.

    What is the average number of hours (for an experienced "solder slinger") required to build one?
     
    David likes this.
  16. Wntrmute2

    Wntrmute2 Junior Member

    I'm a little more than a rookie and it took me a couple of evening's to get the boards soldered up. A couple of more nights for the mock up and fitment of all the parts. Worth the effort.
     
  17. TubeHiFiNut

    TubeHiFiNut Administrator Staff Member

    Thank you, @Wntrmure2 :)

    I'll have to pay to get it done and appreciate the estimate. :)
     
  18. Thermionics

    Thermionics Post Whore In Training

    Mine is done. Swapped it for the previous generation AD797 in my office preamplifier. So far, so good!

    -D
     
    sachu888 likes this.
  19. sachu888

    sachu888 Junior Member

    I may help solder the board and shipped it to you if you want. You may need to do all the wiring.

    Regards
    Sachin
     
  20. TubeHiFiNut

    TubeHiFiNut Administrator Staff Member

    Thank you, Sachin.

    That is extremely kind of you.

    I'll PM you so we can discuss.
     

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