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STK-0050 replacement for SX-780 and others

Discussion in 'Pioneer Audio' started by rcs16, Jun 18, 2016.

  1. rcs16

    rcs16 Super Member

    Messages:
    3,898
    Location:
    Baldwin, Ontario, Canada
    Hi Peter,

    Solid contribution = cool

    Where is "near Toronto" N,S (swim) ,E,W ? :) I am in the N

    I should rig one of these up to test and measure out this design (need a pcb for that :), no one has done so, guess because of lack of equipment or other. Only make claim with sim specs. Do not have a 780, but the input and voltage amp section can be wired up on proto board or a small pcb, one day, maybe this winter. I have power supplies.

    Cheers
    Rick
     

     

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  2. Rational35

    Rational35 LME49710 NLA? OK, I have 6SN7s Subscriber

    Messages:
    20
    Location:
    44.079,-80.214
    Merlyn, you are first on the list.
    I will PM you for your snail-mail address when the pcbs arrive.
    Two pair are still up for grabs.
     
    merlynski likes this.
  3. Rational35

    Rational35 LME49710 NLA? OK, I have 6SN7s Subscriber

    Messages:
    20
    Location:
    44.079,-80.214
    Rick- Thanks! You're just south of Sutton, right? I'm in Shelburne, just over an hour drive west of you.
    I can hook you up with a module to play with, once I get everything in place here. I kept 2 spares back, for exactly this sort of reason.

    What do you have for test equipment? There's a Focusrite Scarlett 2i2 interface, a Dayton EMM-6 microphone, and a DATS-V2 in my near future, so I can do proper measurements on some speaker projects I have on the back-burner. While maybe not up to AP standards, I think the 2i2 should suffice for any noise/distortion/fr measurements I'm likely to need. In the meantime, it's desktop motherboard soundcard, and a collection of vintage analog scopes, home-brew signal generators, and such around here.

    Cheers,
    Peter
     
  4. merlynski

    merlynski Curmudgeon Electronicist Subscriber

    Messages:
    432
    Location:
    High Plains, Eastern Colorado
    Thank you!
     
  5. rcs16

    rcs16 Super Member

    Messages:
    3,898
    Location:
    Baldwin, Ontario, Canada
    Hi Peter,

    Yeah, south of Sutton. I have an old Amber 3501 audio test set.
     
    Rational35 likes this.
  6. Kingbleu

    Kingbleu Active Member

    Messages:
    182
    Location:
    Southern California
    I successfully completed building a pair of the STK modules. My modules function and operate perfectly, everything works good and the bias adjusts great. The only thing I don't like is the way I connected them with wire, I just wish there was a better or cleaner way to solder those wires in. The pictures of completed packs, that others have done and posted on this thread look great and the installations look very clean, but my modules don't look so good.

    I have two Pioneer SX-780's one that works and one that doesn't. I put the new STK modules that I built in the working receiver and took the original STK modules from the working receiver and put them in the non working receiver. I was hoping that replacing the STK's in the non working SX-780 would fix the problem but it did not. I started a thread here http://audiokarma.org/forums/index....on-no-sound-darlington-packs-are-good.839687/ if any of you want to take a look at it. Thank you.
     
    rcs16 likes this.

     

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  7. Rational35

    Rational35 LME49710 NLA? OK, I have 6SN7s Subscriber

    Messages:
    20
    Location:
    44.079,-80.214
    My package of circuit boards from PCBWay arrived in the mail today.
    Cursory inspection says: They look just fine :)

    I guess I'd better find time to make some mounting/heat spreader plates, and order parts from Mouser.

    Still 2 pair of bare boards up for grabs as an AK subscriber bonus.
     
    dlucy likes this.
  8. rcs16

    rcs16 Super Member

    Messages:
    3,898
    Location:
    Baldwin, Ontario, Canada
    Good to hear, what plating did they give you? default is leaded hasl iirc.
    I'am still amazed that we can get them so cheap, in the old days they killed you with setup charges .
    some assembly notes
    align, form fit the bjt leads using the threaded holes for alignment before soldering them.
    I was told to make the bottom side solder pads bigger :)

    As you know I would like a couple to play with, if this is possible, I do not need any to be assembled since I want to play with the different stuffing options and do some measurements.
    I'll have to wire up a input & vas gain stage to replicate what is in the 780. I'll shoot you the$ for posting,

    good luck with your build
     
  9. Rational35

    Rational35 LME49710 NLA? OK, I have 6SN7s Subscriber

    Messages:
    20
    Location:
    44.079,-80.214
    Looks like leaded hasl (I think I specified that when I ordered). $1 per board is a beautiful thing.
    assembly notes make sense.
    I would have made a few of the pads bigger, but I think these will be fine.
    PM re extra boards :)
     

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