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    STUDER 810 MK II

    Check the setting on peripheral control: JS4: Automatic muting during spooling (AUTO MUTE) JS 4 =0 ----> AUTO MUTE off JS 4 =1 -----> AUTO MUTE on (Although I see no difference when JS4 was On or Off. But my MPU board was 1.820.780.82; with 25/91 firmware) Make sure that JS8 had been set to...
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    STUDER A820: Slow action of break; a quick fix

    Further inspection revealed the cause behind the delay: missing part of the cushion? Pictures shown the inside of the solenoid: Healthy one (Right picture) has a shinning reflective flat surface on the tip of the cone while that with delayed action (left picture) had a cushioned material...
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    STUDER A820: Slow action of break; a quick fix

    I went back to my wax paper solution again since long press STOP or PLAY did create time lag between two plunger action. This lag can not be eliminated no matter how I screw those two hex. Yeun-Jung Wu
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    STUDER A820: Slow action of break; a quick fix

    I got a good suggestion from a member of tapehead forum. https://www.tapeheads.net/showthread.php?p=775592782&posted=1#post775592782 Now both solenoids worked as expected in their original state. Yeun-Jung Wu
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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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    added a 3rd Studer A-820 Mk2 with both 1/4" and 1/2" heads, guides and hubs

    I had misplaced pre-stabilizer roller and move sensor roller once; my A820 had problem FF and rewinding. Groves on move sensor roller do have its function: it will prevent thin air developed between tape and roller surface at high spooling. Tape air cushioning created a problem that roller no...
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    Studer A 810 fuses location

    What is the point of "improvement of sound by replacing fuss"? STUDER's construction had many more contact points to worry; it would certainly be a nightmare if you do start worrying fuss as the first step of sound improvement. Eliminating power plug connector all together and solder a heavy...
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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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    STUDER A820 Spooling problem.

    It was the misplacement of pre-stabilzer roller and move sensor roller, a simple mistake finally being traced down. Now everything was back to normal. Something simple thing got messed up un-noticed.... A slip of mind due to fatigue? Hard to trace something you take for granted. Photos taken...
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    Wireless remote control for STUDER A820

    Hello Ki: I hide the content of the receiver behind that ugly empty PCB board. Link to A820/A807/A812/A816 follows: https://www.teacremotes.com/revoxremotes/Studer_A807.htm Do you have any suggestion on my spooling problem? I though I became less creative facing old problems encountered...
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    Wireless remote control for STUDER A820

    Not perfect but working.
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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 all STUDER experts: Follow up with pictures: Motor Tacho (Spooling) Left (Pin 1, 2; Pin 21 GND) Move Sensor Tacho (Pin 7, 8; Pin 21 GND) Motor Tacho (Spooling) Right (Pin 3, 4; Pin 21 GND) I removed left spooling motor and its tacho board for inspection: nothing special since the...
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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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    New Updates On The New Metaxas Reel To Reel Location Tape Deck.

    How was azimuthal angle be fine-tuned in this case?
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    Studer A820 MKI vs MKII

    Here is the photo of tension arm of STUDER D827: transparant part is wear resistant but non-rolling. Earlier A820 was white ceramic guide.
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    Studer A820 MKI vs MKII

    It is great to be able to meet key person of STUDER list here! Greetings! Best Regards, Yeun-Jung Wu
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    Studer A820 MKI vs MKII

    Thank you Alan for your comment on HXPro and skimming. According to SI some early Mk-I's had non-rolling ceramic pad on both tension arms. Several range of serial numbers of Mk-I had early type of capstan motor, which need matching driver board. There was also a HW/SW compatibly table on...
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    Studer A820 MKI vs MKII

    If you ever completed the adjustment of pinch roller gap to 0.1mm you will know that your A820 was a Mk-I. You should also find a pair of 811/813 which enable HX-pro capability in recording in a A820 Mk-II. You will not find "REC-AMP 820.812 820.712" marking on a A820 Mk-II, instead it will...
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    Ballfinger M063 both 1/4 track and 1/2 Track playback

    If magnetic head and audio electronics for M063 and Thorens TM1600 were all the same, I predict TM1600 will hold its promise for a longer time. No hard to comprehend theory is involved; only simple common sense. Tape transport is mechanical in nature. For any movable parts to operate smoothly...
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    Ballfinger M063 both 1/4 track and 1/2 Track playback

    In this design the alignment error of record head is inherited more pronounced than reproduce head simply because it was positioned further away from the headblock pivot point than reproduce head did. We use very long base line, up to 5 meters, to amplify small torsional angle displacement in...
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    Ballfinger M063 both 1/4 track and 1/2 Track playback

    I wondered how people would commit such large sum of money to a brand new reel to reel tape recorder without inquiring to the technical detail; at least waiting for some third party test report to surface? How does it perform in compared to our beloved, say STUDER A810, A820, Ampex ATR102, Otari...
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    Studer A80 preview machine need rollers

    I do not have A80. I just make up the story by looking up the threading chart. It looks like you can still do 7.5" - 45, 7.5" - 33.3; 15" - 45. You need one more roller to do 15" - 33.3; additional two more rollers to do 30" - 45 and 30" - 33.3. 15" -45 should be the default configuration...
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    Studer A820 owner/operator training in Los Angeles

    Opening quiz: how to disengage pinch roller manually using hex driver at emergency after power off? A good mid-term exam would be: reconnect all the cable connectors on top of the card cage; explain the "from" "to" and functionality of each card. This might be too easy. Yeun-Jung Wu
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    Studer A820 in for repair!

    Hello Fred: Thank you for your detailed explanation. Yes, my A820 has the same parking position "issue". I wondered that roller would be a little bit "down" so tape will not touch it at fast rewind. That was after I learned how to switch F253 wind mode A/B. Still later did I realize the...
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    Studer A820 in for repair!

    What is the real cause of anomaly with positioning of left guide roller in fast wind modes? Any input? The modification was on tape lifter control right.
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    Studer A820 in for repair!

    Hello Mike: It is great to hear different opinions on well taken cared A820. Is it a good suggestion to update to latest firmware? Someone complains lack of damper design in compared to other STUDER's pro machines, which rendered A820 prone to oscillation...
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    Advice in buying a Studer A80

    Thank you Fred and microstrip for pointing out the link of flutter analysis. When I started collecting professional tape machines since 2011 the last measuring instrument I intended to get was flutter meter. Why? My reason was this instrument will give you a number but you hardly have any mean...
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    Advice in buying a Studer A80

    Just being curious: what would be the result of wide band FFT flutter analysis of well tuned STUDER A80, A820 v.s. Nagra T-Audio? What signature would appear for different transport design? How about OTARI MTR-15? AMPEX APR-102? Lyrec PTR-1 "Frida"? Telefunken M15/M15A? SONY APR-5000? Also...
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    Advice in buying a Studer A80

    I do not own any model of A80. About a year ago I browsed this YouTube video clavichord musician Wim Winter started as the studio project. https://youtu.be/_pWERhs4uCk It ended with a sad story. His A80 was put together by Andreas Kuhn from Switzerland. https://youtu.be/Sp0BGq4GD-w I don't...

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