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Thread: Conrad's custom arc generator.

  1. #1
    Join Date: Aug 2016

    Location: Manchester

    Posts: 122
    I'm Nick.

    Default Conrad's custom arc generator.

    Help needed chaps.

    Apart from pivot to spindle distance, what other figures do I enter
    For a mission 774.
    For the life of me I can't get the effective length of 229mm as in the
    Manual.

    Cheers
    Nick.

  2. #2
    Join Date: Aug 2012

    Location: Hartlepool UK

    Posts: 1,640
    I'm Alan.

    Default

    Turntable - Garrard 401/Jelco 750L/Ortofon Kontrapunkt B, Pioneer PLC 590, Micro Sieki MA505 , Denon DL103R - DIY Paradise Phono stage - Reel 2 Reel Studer A810, Otari MX55,Tascam BR20, Revox A77, B77, PR99, TEAC X1000 & 3440, Digital HTPC / Young Dac - Preamp - DIY B4, 821, Power Amp's DIY Avondale NCC300 Mono Block, Speakers Wilmslow Kit Volt BM220.8 / Scanspeak D2905/9500

  3. #3
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,737
    I'm jamie.

    Default

    Quote Originally Posted by Nickfna View Post
    Help needed chaps.

    Apart from pivot to spindle distance, what other figures do I enter
    For a mission 774.
    For the life of me I can't get the effective length of 229mm as in the
    Manual.

    Cheers
    Nick.
    thats all you need to do isn't it?
    i also click on the IEC tab as well.
    hope that helps.
    My System
    John Wood KT88 Amp.
    Paradise Phono Stage
    Sony TTS-8000 Turntable.
    PMAT-1010 MK6 Tonearm.
    Ortofon Cadenza Bronze
    Sony X555ES Cd Player
    Yamaha NS1000m Speakers

  4. #4
    Join Date: Apr 2011

    Location: Northamptonshire

    Posts: 185
    I'm Angus.

    Default Mission 774

    There is clearly an error in the manual for the 774.

    If the effective length is 229mm, and the pivot-to-spindle is 215.4 as shown on the sketch in the manual, then the overhang is only 13.6mm, well less than that for a Stevenson alignment.

    If you assume that the offset angle is 23.5 deg, about right for Lofgren A on a 229mm arm, then a pivot-to-spindle of 215.4 gives you one null point at about 140mm radius, and a distortion peak of 2.5%.

    It will be worth trying to measure the offset angle (I can't find it specified anywhere), and then look at alignments with that offset and 215.4mm pivot-to-spindle.

    Hope this helps.

    regards

    Angus

  5. #5
    Join Date: Aug 2016

    Location: Manchester

    Posts: 122
    I'm Nick.

    Default

    Thanks for the replies guys.

    Tried your suggestion Jamie, the best i can get is the Stevenson A settings which give
    the effective length as 231.258 and an overhang of 15.858.

    Don't know if there is an error in the manual Angus, but it's bloody frustrating.

  6. #6
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,737
    I'm jamie.

    Default

    why not just go with the 215.4 mounting distance that seems to be right judging by the web and move the arm back or forth to get your alignment dialed in,in my way of thinking the effective length will be different depending on what cartridge you use so it cant be set in stone,the mounting distance however is.
    My System
    John Wood KT88 Amp.
    Paradise Phono Stage
    Sony TTS-8000 Turntable.
    PMAT-1010 MK6 Tonearm.
    Ortofon Cadenza Bronze
    Sony X555ES Cd Player
    Yamaha NS1000m Speakers

  7. #7
    Join Date: Aug 2016

    Location: Manchester

    Posts: 122
    I'm Nick.

    Default

    Just found this

    http://www.hifisentralen.no/forumet/...-original.html

    These measurements are the same settings as what you advised Jamie, cheers

  8. #8
    Join Date: Mar 2008

    Location: Galashiels

    Posts: 13,669
    I'm inthescottishmafia.

    Default

    “Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”

    Hunter S Thompson

  9. #9
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,737
    I'm jamie.

    Default

    where's all the 774 boys when you need them?
    their quick enough to shout my arms the best in the world,a technical question is asked and their no where to be seen!

    disclaimer,the above is in jest!
    My System
    John Wood KT88 Amp.
    Paradise Phono Stage
    Sony TTS-8000 Turntable.
    PMAT-1010 MK6 Tonearm.
    Ortofon Cadenza Bronze
    Sony X555ES Cd Player
    Yamaha NS1000m Speakers

  10. #10
    Join Date: Mar 2008

    Location: Galashiels

    Posts: 13,669
    I'm inthescottishmafia.

    Default

    LOL just did!
    “Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”

    Hunter S Thompson

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