Can I fix a mark Levinson 33 Monoblock thread

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  • F1nut
    F1nut Posts: 51,655
    It truly is a overly complex piece of equipment

    Fixed it for you 🤑
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • VR3
    VR3 Posts: 29,382
    edited April 17
    Lol!

    I found a handful of suspect parts that seem to be associated with some nearby op amps (which are in line with those resistors)

    gdhkuxwbo1b2.jpg
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    Post edited by VR3 on
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 29,382
    edited April 17
    Some of the guys at diyaudio have changed out the 555 timer to a lower noise ICM7555IPAZ, I guess it's the heart of the oscillator so to speak.

    I sourced a military version of the ad705aq so I ordered 20 (minimum order). This opamp is used in a few other places in the amp as well.

    There is also a new version replacement of another ic I will go ahead and replace.

    I plan to rebuild the control board before I order anymore regenerator parts.

    The fun continues!
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • SCompRacer
    SCompRacer Posts: 9,077
    edited April 17
    I can't work with pdf schematics on the 'putie anymore. I go to FedEx Office, print them in large format (one was 24"x36"), and highlight the circuit.

    Didn't Ken post an inexpensive op amp tester a while back?

    6uqlpmuy3w3s.jpg


    Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ * Signature Series Sonore Music Server w/Deux PS * Roon * Gustard R26 DAC / Singxer SU-6 DDC * 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 *
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  • VR3
    VR3 Posts: 29,382
    I will have to see if I can source an inexpensive op amp tester.

    I have been looking cross eyed at cap meters that go from 10 PF to 60,000uf but my eyes went a little cross eyed pricing it out. My current software only goes from .01uf to 10,000uf.

    I honestly see the appeal to printing out these schematics, theres alot of information to digest here.

    I did start a One Note document I have been building as I go here loading in the schematics and paperwork per board and documenting parts I ordered for future reference//// next owner if I ever decide to sell.

    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • SCompRacer
    SCompRacer Posts: 9,077
    edited April 17
    Thats good documenting your repairs/upgrades. I've done that and pass it on.

    Sometimes the quality of downloaded scanned pdf manuals and schematics are poor. Sometimes there are more than one out there and are better, so I'll shop around.

    Originals can be scarce and pricey. I lucked out and got an original service manual and schematic off ebay for my A-6300 for 20 bucks shipped. I've seen them sell for $100. The DL wasn't too bad but the original pops with voltage readings in color.

    I've read there are some fee based companies selling high quality copies but didn't save the link.

    1pkkw07gxci7.png

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    Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ * Signature Series Sonore Music Server w/Deux PS * Roon * Gustard R26 DAC / Singxer SU-6 DDC * 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 *
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  • Toolfan66
    Toolfan66 Posts: 17,978
    Some of you guys are truly mad men, I love watching stuff unfold as you guys do work like this, I for one wouldn’t get this deep, I probably would be the one to touch the wrong area, and knock myself to the ground. LOL!!

    Great thread Trey..
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,269
    edited April 18
    This one worked fine for me:

    https://www.amazon.com/dp/B09SVL31V5?ref=ppx_yo2ov_dt_b_fed_asin_title

    But looks like it's not available currently, sorry. I'd be happy to send mine to you if you'd like.
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  • VR3
    VR3 Posts: 29,382
    I ordered this, should be here in a few weeks

    5n4r8g9u7sfh.jpg
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • treitz3
    treitz3 Posts: 19,942
    What in Scooter's creation is that?

    Tom
    ~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
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  • VR3
    VR3 Posts: 29,382
    Op amp tester
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • VR3
    VR3 Posts: 29,382
    edited July 8
    So all caps replaced... Electrolytic, film, ceramic.
    Replaced all relays
    Replaced both op amps... The old ones measured good on the tester but I ordered 75 new ones so... Why not replace!
    Replaced around 40 resistors. I wanted to replace one pair but no one carried an equivalent quality. The resistor still measures perfect but just looks like it has been hot in the past. All of the resistors I installed are further from the board as well.

    Finally catching up to where I can tackle this again! Should be able to knock some out this week for sure! 😁

    zh1tl98xi511.jpg
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • F1nut
    F1nut Posts: 51,655
    Better you than me...lol
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • VR3
    VR3 Posts: 29,382
    edited July 9
    Lol, i honestly find it somewhat therapeutic... Strangely enough

    Obviously it would be nice that it worked once I'm done hahahhahhahahhaha but I've learned alot working on it so far and gathered tools that will be helpful for future projects.

    The biggest investment so far have been Desoldering tips... Jeebus those bad boys are expensive but you definitely have to have the right size for different size pads, no question!
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • skipshot12
    skipshot12 Posts: 1,769
    As bad as doing a KSA-250, more patience than most.... nice.
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  • invalid
    invalid Posts: 1,439
    skipshot12 wrote: »
    As bad as doing a KSA-250, more patience than most.... nice.

    It's looks far more complex than a ksa 250. I'm not looking forward to fixing my ksa 300s, which is more complex than the ksa 250 also.
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  • skipshot12
    skipshot12 Posts: 1,769
    Wow, you deal around me.
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  • skrol
    skrol Posts: 3,437
    VR3 wrote: »
    How about this guy who was never soldered from the factory

    rt5xcr5045e2.jpg

    I found similar when I did the XOs in my RTA11TLs. On one of the XOs the 12uF electrolytic cap that is paralleled with the 1.5ohm resistor was looped around the leads of the resistor but not soldered.
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade), Parasound: P/LD-1100, HCA-1000A; Denon: DVD-2910, DRM-800A; Benchmark DAC1, Monster HTS3600-MKII, Grado SR-225i; Technics SL-J2, Parasound PPH-100.

    HT:
    Marantz SR7010, Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S4, CS250, PSW110 , Marantz UD5005, Pioneer PL-530, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, AVR-888, DCD-660, DRM-700A, DRR-780; Polk: S8, Monitor 5A, 5B, TSi100, RM7, PSW10 (DXi104 upgrade); Pioneer: CT-6R; Onkyo CP-1046F; Ortofon OM5E, Marantz: PM5004, CD5004, CDR-615; Parasound C/PT-600, HCA-800ii, Sony CDP-650ESD, Technics SA 5070, B&W DM601
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  • treitz3
    treitz3 Posts: 19,942
    Dang...

    Tom
    ~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
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  • billbillw
    billbillw Posts: 7,441
    That's what you call Friday afternoon production!
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