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OC71

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Posts posted by OC71

  1. Additional information on the Scott amp:

    Purchased in 2019 off Craigslist.  It was completely rebuilt by Frank Mufich prior to my purchase.  I knew Frank and confirmed that before i bought it.

     

    The following work was performed:

    replace all electrolytic capacitors

    rebuild the preamp filament bias supply left in a mess from previous repair

    replace selenium bridge rectifier with Silicon bridge

    replace voltage dropping resistors on the electrolytic capacitor upgrade

    replace many out of tolerance stressed over supply voltage dropping resistors

    replace plate coupling capacitors for tone section and line stage

    intall ICL (inrush current limiter) soft start to make it last longer

    install 10 ohm resistors into output tube cathodes for transformer protection

    replace output tubes with matched quad Electro Harmonix 7591A

    replace the phono stage coupling capacitors

    re-bias output stage

    clean and re-tension rear connector jacks, clean speaker terminals 

    clean and lubricate controls and switches

    test distortion, frequency response, channel balance and power output.

     

    I later took it to Frank to repair a problem with the phono stage.  I have a wood case for the amp that is included in the sale but the current tubes are too tall for the case.

     

     

     

  2. I purchased these K-Horns on this site from Dave Mallette in August 2020,  My listening room was being redone so I planned to make some improvements and have them ready when construction was finished.  In the interim I was able to acquire a pair of Cornwalls in a trade.  I have decided to keep the Cornwalls and have lost enthusiasm for the K-Horn project.  I never auditioned the speakers but my understanding is they were in working order when I acquired them.  Price:  $1,000 (what I paid); $1,100 with Crites speaker cloth (cost $190).

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