On a CHIP hunt.

soundfreak1soundfreak1 Posts: 2,731
Rebuilding a vintage Nakimichi EC100/PS100 external cover for my biased system, have recapped both with nichicon caps but what's the best opa''s put in pin sockets so I can "roll" chips easily using TI- NJM 4560''S right now but looking for the best possible chip price no object! TI, BURR BROWN opa 2134, or other offerings??? Would like some input. Check dignitary for the system. Thanks.
Main Rig:
Krell KAV 250a biamped to mid/highs
Parasound HCA1500A biamped to lows
Nakamichi EC100 Active xover
MIT exp 1 ic's
Perreaux SA33 class A preamp
AQ kingcobra ic's
YAMMY cdp
Lehmann audio black cube SE phono pre, Audioquest phono wire (ITA1/1)
Denon DP-1200 TT. AToc9ML MC cart.
Monster HTS 3600 power conditioner
ADS L1590/2 Biamped
MIT exps2 speaker cable

Comments

  • heiney9heiney9 Posts: 23,460
    Discrete would be the best.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30 | EE Avant Pre | EE Mini Max Plus DAC | MIT Shotgun S3 | MIT Z P/C's | updated SDA 1C| SQ Box Touch/Welbourne Labs P/S- Tubes add soul!
  • soundfreak1soundfreak1 Posts: 2,731
    Heiney9 could you be a little less discreet?
    Main Rig:
    Krell KAV 250a biamped to mid/highs
    Parasound HCA1500A biamped to lows
    Nakamichi EC100 Active xover
    MIT exp 1 ic's
    Perreaux SA33 class A preamp
    AQ kingcobra ic's
    YAMMY cdp
    Lehmann audio black cube SE phono pre, Audioquest phono wire (ITA1/1)
    Denon DP-1200 TT. AToc9ML MC cart.
    Monster HTS 3600 power conditioner
    ADS L1590/2 Biamped
    MIT exps2 speaker cable
  • SCompRacerSCompRacer Posts: 6,590
    edited May 17
    I don't think he has that much room in the xover box for discrete unless he lays them flat and does extension leads. Watch for power requirements though. IIRC the 4560 is up there for mV/mA while some replacements are a bit less, discrete could be way more than current PS allows for.
    Make yourself necessary to someone. Ralph Waldo Emerson

    Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ & Pro 11+ * Signature Series Sonore Music Server w/Deux PS* Twisted Pear Buffalo III Dual Mono ESS Sabre32 DAC * Heavy Plinth Lenco L75 Idler Drive * AA MG-1 Linear Air Bearing Arm * AT33PTG/II & Denon 103R * Richard Gray 600S * NHT B-12d subs * GIK Acoustic Treatments * Sennheiser HD650 *

  • FTGVFTGV Posts: 3,530
    edited May 17
    I'm using the National/TI LME49720's in a couple of active crossovers and can recommend them without hesitation as my preference over the OPA2134 and 2604. They are clean,stable(won't oscillate) very low noise and neutral sounding. (They were rumoured to be discontinued but Digi Key still has stock). In fact it is getting harder to find 8pin DIP devices since many new parts are being introduced in SMD packages only so require the use of an adaptor board to work in the DIP socket. If you want to mess with adaptors it does open up more choices.
    As Rich mentions a discrete design will likely pull more current from the supply so that needs to be a consideration if you are using several. On the other hand just because it is a discrete design does not necessarily mean it will be sonically superior to one of the better IC opamps.
    While your at it you might want to make sure there are decoupling capacitors close to the two power pins of each IC socket.
  • SCompRacerSCompRacer Posts: 6,590
    edited May 17
    FTGV wrote: »
    I'm using the National/TI LME49720's in a couple of active crossovers and can recommend them without hesitation as my preference over the OPA2134 and 2604.

    Nice op amp that LME49720! Twisted Pear uses those in their DAC I/V stages, the IVY and the SE side of the Legato.
    Make yourself necessary to someone. Ralph Waldo Emerson

    Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ & Pro 11+ * Signature Series Sonore Music Server w/Deux PS* Twisted Pear Buffalo III Dual Mono ESS Sabre32 DAC * Heavy Plinth Lenco L75 Idler Drive * AA MG-1 Linear Air Bearing Arm * AT33PTG/II & Denon 103R * Richard Gray 600S * NHT B-12d subs * GIK Acoustic Treatments * Sennheiser HD650 *

  • soundfreak1soundfreak1 Posts: 2,731
    Have used the TI'S in a couple of DAC'S but was curious as the price range I'm hearing is from 7 to 30 buck's not much different "for top of the line " at those price points points. Dip's are already installed as well as a full recap in each piece.
    Main Rig:
    Krell KAV 250a biamped to mid/highs
    Parasound HCA1500A biamped to lows
    Nakamichi EC100 Active xover
    MIT exp 1 ic's
    Perreaux SA33 class A preamp
    AQ kingcobra ic's
    YAMMY cdp
    Lehmann audio black cube SE phono pre, Audioquest phono wire (ITA1/1)
    Denon DP-1200 TT. AToc9ML MC cart.
    Monster HTS 3600 power conditioner
    ADS L1590/2 Biamped
    MIT exps2 speaker cable
  • msgmsg Posts: 3,488
    I don't really know what you guys are talking about, but sure sounds fun. Whatever it is, I'm pretty sure two CHIPs would be best, and I recommend these vintage ones.
    3zw197f1ep6h.jpg
  • heiney9heiney9 Posts: 23,460
    edited May 18
    Ditto on the LME49720. Used those before I went discrete and they were very nice. Maybe slightly tilted towards the highs, but not grainy or over the top. Of course as Rich pointed out, space is probably an issue for going discrete.

    If the dips are there, then it's like tube rolling only with solid state! Get a few and roll them to see which you like best. Just be careful and make sure when swapping that they are oriented correctly or you might let out all the magic smoke!

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30 | EE Avant Pre | EE Mini Max Plus DAC | MIT Shotgun S3 | MIT Z P/C's | updated SDA 1C| SQ Box Touch/Welbourne Labs P/S- Tubes add soul!
  • soundfreak1soundfreak1 Posts: 2,731
    My tech is checking his inventory and see what he has to play with, he likes the njm4560 for all around sound as I listen to mostly (90%) acoustic jazz it might be worthwhile in rolling a set of opa 2134''s to see what if any advantages may arise. Just trying to see what other peeps have experience with. Thanks all and any more input is appreciated.
    Main Rig:
    Krell KAV 250a biamped to mid/highs
    Parasound HCA1500A biamped to lows
    Nakamichi EC100 Active xover
    MIT exp 1 ic's
    Perreaux SA33 class A preamp
    AQ kingcobra ic's
    YAMMY cdp
    Lehmann audio black cube SE phono pre, Audioquest phono wire (ITA1/1)
    Denon DP-1200 TT. AToc9ML MC cart.
    Monster HTS 3600 power conditioner
    ADS L1590/2 Biamped
    MIT exps2 speaker cable
  • doctor rdoctor r Posts: 778
    Replaced my OPA2604 chips with OPA627BP Chips Mounted on Brown Dog adaptors. Excellent sound but one of the 8 chips I have did oscillate if I remember. I have 8 of these chips and 4 prefabricated brown dog adaptors if you are interested. They have been sitting idle for a few years since I parted with the CDs they were used in and really need to find a home where they are appreciated.
    Rick
    VAC Renaissance MKIII with phono
    Ayre VX-5 Twenty
    Origin Live Resolution Mk3-1
    Origin Live Illustrious Mk3c
    Ortofon Cadenza Bronze
    Logitech Touch w/Welbourne PS
    Ayre Codex
    Thiel CS2.4
    Audience AU24 SX and SE cables
    Audience aR6-TSSD
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