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    STUDER A820: Slow action of break; a quick fix

    I don't know whether you experienced this problem before: the release of break solenoid plunger of left spooling motor break of my STUDER A820 was prolonged to be about ten seconds. I tried to disassembled the break solenoid and hold it up right to test whether gravity will pull the plunger down...
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    Roller height check

    During the pandemic I had some "free time" under quarantine. Browsing some STUDER technical information I spotted an interesting section of checking roller height of STUDER A820 MCH recorder for 2" tape. Driven by curiosity I wondered how good the relative height of my 1/4" A820 rollers would...
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    Wireless remote control for STUDER A820

    My A820 still suffered from spoolng problem and parts are in journey. I don't know whether new parts will solve it. A few years ago I purchased a wireless remote control from eBay. It can control my A820, A807 Mk-I and A807 Mk-II. It was a small sat-up box plugged into parallel port. Last...
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    STUDER A820 Spooling problem.

    Hello R2R experts: I had been working on solving this problem on and off for half a month now. My STUDER A820 start to behave strangely on mid July: machine can not load the tape although LCD displayed no errors. I struggled to locate a bad RC4559 on right tension sensor board 1.820.772 and...
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    Phase compensation; STUDER A810

    My first R2R was a ReVox B77 Mk-II, bought in July, 1990. I was told that it was equalized in CCIR, not the usual NAB equilization in north America. I did a frequency response test on that B77 and found the recorded square wave was not as beautiful as it supposed to be. I wrote a letter to...
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    STUDER A820: INCORRECT RADIUS MEASUREMENT; can not FF/rewind; any suggestion?

    Hello STUDER experts: Recently my STUDER A820 developed a problem which prevented it from FF/rewinding/library winding; soon after the command was issued an error message INCORRECT RADIUS MEASUREMENT appeared briefly; then tape tension dropped, tape unloaded. According to the manual the...
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    STUDER A820 1/4" morphed into 1/2"

    I just added 1/2" tape playing (recording will be waited until calibration is done) capability to my STUDER A820, which was resurrected on June 16, 2014, after 16 days working in dark. Magnetic head assembly was pieced together from: 1) A STUDER time code demo assembly; maybe a historical...
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    New recruitment: a 1/4" STUDER A820

    I got this STUDER also in non-functional state: none of the green LED's were lit as I got it on May 31, 2014; only a pulsing rotation of the take-up reel table at power on. After half month's struggle I located a fault of two gold fingers on master MP board, the machine started self-diagonosis...
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    New recruitment: a 1/4" STUDER A820

    I got this STUDER also in non-functional state: none of the green LED's were lit as I got it on May 31, 2014; only a pulsing rotation of the take-up reel table at power on. After half month's struggle I located a fault of two gold fingers on master MP board, the machine started self-diagonosis...

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