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Thread: Changing between Studer A820 quarter and half-inch headblocks

  1. #11
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    Quote Originally Posted by c1ferrari View Post
    Wow, Yeun-Jung -- I've never seen a 4-channel TC erase head on an A820 -- thanks for sharing!
    Hi Sam:

    I don't know anything about TC in four track configuration. Wish Fred can tell us the story behind the leading and trailing thin part of erase head. All three heads are for STUDER A807 1/2" four track version. I modified the base shielding of reproduce head to the style fit for A820 and A812's.

    Yeun-Jung Wu
    Last edited by yjwu; 12-20-2016 at 12:48 AM.

  2. #12
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    My fault: there is no rechargeable battery in STUDER A820. Backup of CMOS SRAM was done by a 1/2AA, 3.6V lithium battery. There wasn't enough space for installing a battery holder, two metal clippers was there to hold the battery and made electrical contact.

    My A820 came without battery holder and any battery on master MPU card two and a half years ago. Actually this card had contact problem which took me half a month to track down. I follow the thinking of A810 and installed a rechargeable lithium battery for it. A person from eBay kindly pointed out my mistake. The learning curve keep going! It is the miracle of web interacting world - an universe of connecting people!

    Last minute modification. Now both MP-UNIT MASTER and MP-UNIT TD CONTROL can accept 1/2 AA 3.6V lithium primary battery, as shown in the pictures. The orange solid aluminum electrolytic capacitor has to be moved further back. Battery holders were borrowed from Macintosh LC and Macintosh Classic motherboard. Lithium primary battery was long gone. I installed two pins on the battey holder so that a fully charged lithium rechargeable battery can be used too.

    Happy New Year!

    Yeun-Jung Wu
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    Last edited by yjwu; 01-02-2017 at 12:32 AM.

  3. #13
    Member Sponsor Addicted to Best! rockitman's Avatar
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    drool...like owning a classic '67 Ferrari 275 4 cam in immaculate condition.
    http://www.ebay.com/itm/201768483638...%3AMEBIDX%3AIT
    Christian

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