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McIntosh Audio A Tradition of Excellence |
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Thread Tools | Display Modes |
#31
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Becoming a member surely has its perks.
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_________________ - Michael Amp: MC1.2KW x 2, MC602, MC2300 Preamp: C52, MX136, C34V Digital Source: Oppo BDP 105, Pioneer 47Ai, CAL MkII Analog Source: MT10, Technics RS 1700 Speakers: VMPS Super Tower lll Subwoofer: JL Audio F113 Power Cables: Wireworld Platinum Electra 7 Speaker Cables: Straightwire Serenade ll Signal Cables: Wireworld Silver Eclipse 7 Power Isolation: RGP 1200C Rack: Adona Eris 9TW modified to Eris 12TW Amp: Yamaha RX Z9 Digital Source: Pioneer BDP 94HD, Oppo UDP-205 Front Speakers: Monitor Audio Center Speaker: B&W CC6 Rear Speakers: B&W DM 602 Surround Speakers: B&W DM 602 Subwoofer: Velodyne SPL 12BV Television: Samsung 75 inch 4K Q90R |
#32
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On my list!
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#33
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UPDATE:
I reflowed a number of solder joints that looked iffy, including the ones mentioned above. In some places I removed that lead-free crap with the desolder station, including connector for J-1 to J-8. I removed Q18 and tested it with my Atlas transistor checker, it reads as a single junction diode. That's no good. When testing the other way there no reading is displayed for Emitter to Base. A multimeter in diode test reads open with leads in either polarity on Emitter to Base. AS I said before, I don't think I have a substitute handy, but I'll check the transistor crossover to and then see if any are here in stock. Don't know if it's progress, but it sure seems like Q18 is going to be the key, as long as nothing elsewhere killed it. EDIT: Nope, nothing here I can use. Maybe I'll order a few from Mouser as well as the caps to do the power supply in my MS-750.. I tried the transistor part number on Audio Classics search page, no results. Not surprising for an off the shelf PNP transistor. Last edited by macman007; 12-01-2019 at 07:52 PM. Reason: more info. |
#34
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Definitely progress...they are cheap so definitely order a few just in case.
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Amplification: McIntosh C2200, NYAL Modified Super-it, Private design Tube monoblocks with Tube-regulated power supplies Sources: Linn LP12/Lingo/Ittok LVIII/Shure V15VxMR, Linn Unidisk SC, ADL GT40, Oppo BDP-105D, Magnum Dynalab Etude FM Tuner, Bell Expressvu 9200 PVR (2) Video: Pioneer Elite Kuro PRO 110FD (50") Speakers: Private design Folded back-loaded corner horns (3-way: JBL drivers) Cables: Linn Silver, Audioquest |
#35
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If you are going to recap the PS in your MS-750 you might as well do the one in your MVP-861, while you are in there. Great piece........ I probably owned mine for more years (10?) than any other piece of gear that's gone thru my system(s).
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Glenn... Canton Reference 9 Clearaudio SM Pro Focal Bathys JLA 10" Dominion Kuzma Stabi S w/MC & MM Magnepan 1,7i McIntosh MA8950 & MR88 Oppo 203 Roon Nucleus Rose Hifi RS150B Shunyata Gemini-4 Sony ST-A6B, TA-F6B, ST-J75 & PS-X75 Sorane SA1.2 & TA-1L Stillpoints LP1v2 WW Pt, Au & Ag |
#36
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Quote:
So all the outputs of the U14 to U17 regulators look good? If so, and you don't have -32V at J1:12, then could you check D4 at both the anode and cathode? This diode is before the D3 diode that you mentioned. By checking D4, you are also kind of checking D5. That small supply doesn't have much, so it's either D4, D5, also D2 and potentially Q18 the potential culprits. And just curious, could you check the resistors R103 and R104. They should be low at 5.6 ohms. Sal
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Main: Mc C2200 (Telefunkens) and MC207, Spectral DMA-180, Marantz AV8805A, JL Audio CR-1 and SAv2, Sony ST-SA5ES, TC-KA3ES and MDS-JA50ES, Oppo UDP-205 and BDP-103D, Bryson BDA-3, Magnum Dynalab FM Signal Sleuth, Remedy, PS Audio P12, Pioneer DT-555, Samsung 65" QLED TV 8K, JBL 4311B, M&K MX125II on Ultra SS Stillpoints, B&W HTM2D2, CCM7.3 S2, CCM683 Office: Sony TA-F700ES (Mod), MDS-JA50ES (Mod) and SEQ-333ES, Accuphase T-107B, Bryston BDA-3, BHA-1 and BUC-1, Audeze LCD-4, Linn Tukan, REL T7 on Ultra SS Stillpoints, PC Server (16 TB) Mobile:Audison bit One Virtuoso HD, bit Play HD, Amps and speakers. Last edited by piolaxo; 12-03-2019 at 12:55 AM. |
#37
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Any progress on your troubleshooting/repair?
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Amplification: McIntosh C2200, NYAL Modified Super-it, Private design Tube monoblocks with Tube-regulated power supplies Sources: Linn LP12/Lingo/Ittok LVIII/Shure V15VxMR, Linn Unidisk SC, ADL GT40, Oppo BDP-105D, Magnum Dynalab Etude FM Tuner, Bell Expressvu 9200 PVR (2) Video: Pioneer Elite Kuro PRO 110FD (50") Speakers: Private design Folded back-loaded corner horns (3-way: JBL drivers) Cables: Linn Silver, Audioquest |
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