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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc. |
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20th Jan 2023, 7:45 pm | #1 |
Diode
Join Date: Jan 2023
Location: Chicago, Illinois, USA.
Posts: 8
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Revox B77.
Hi, I'm new here. And have an issue with the Revox B77 and just want to ask your thought about the issue I have, I've been searching forums and had found no answer yet. So the issue is with Recording on B77 I must keep my finger on the play button (after pushing record and play at the same time). If I remove my finger the record lights go off and the machine stops spinning. everything else works great playing and even recording levels and voltages are fine. Im a mechanical engineer and restore those machines as a hobby, this one put my dead in a track it is fully restored and cleaned most of Capacitors are replaced i got a kit from revox-online .com I did one last year worked without a problems. All calibrations are done and like i said performs flawlessly just that issue with recording, i suspect the Oscillator card or even audio integration board a specially REC LED's. thanks for input.
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20th Jan 2023, 8:10 pm | #2 |
Dekatron
Join Date: Jul 2008
Location: Kington, Herefordshire, UK.
Posts: 3,674
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Re: Revox B77.
Welcome aboard! First thing to check is that the autostop is working properly - put a piece of paper in front of the IR sensor and see if the machine runs in record. It may be that the additional load in Record is affecting the autostop's trigger threshold.
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20th Jan 2023, 10:41 pm | #3 |
Octode
Join Date: May 2007
Location: Liss, Hampshire, UK.
Posts: 1,875
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Re: Revox B77.
Does this only happen in record or does it happen in playback too?
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21st Jan 2023, 12:29 am | #4 |
Moderator
Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 7,225
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Re: Revox B77.
I would suspect one or both of the 2200uF 40V capacitors on the power supply board.
In record, the machine draws a bit more current which can bring the voltages down just enough to not work correctly. I had this once before only in my case, none of the functions worked correctly. A check on the 24V unregulated line showed it to be 23V which dipped to 19V when any function was selected. |
22nd Jan 2023, 1:56 am | #5 |
Diode
Join Date: Jan 2023
Location: Chicago, Illinois, USA.
Posts: 8
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Re: Revox B77.
Thanks for your thoughts, I recapped power supply board completely I will check 2200 caps they can be faulty.
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22nd Jan 2023, 1:57 am | #6 |
Diode
Join Date: Jan 2023
Location: Chicago, Illinois, USA.
Posts: 8
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Re: Revox B77.
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22nd Jan 2023, 1:58 am | #7 |
Diode
Join Date: Jan 2023
Location: Chicago, Illinois, USA.
Posts: 8
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Re: Revox B77.
IR works fine I checked it already.
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22nd Jan 2023, 2:00 am | #8 | |
Diode
Join Date: Jan 2023
Location: Chicago, Illinois, USA.
Posts: 8
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Re: Revox B77.
Quote:
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22nd Jan 2023, 3:07 pm | #9 |
Dekatron
Join Date: Jan 2003
Location: Bradford on Avon, Wiltshire, UK.
Posts: 3,310
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Re: Revox B77.
Maybe a daft question, but is the remote control plug( with appropriate wire links) present?
__________________
"Nothing is as dangerous as being too modern;one is apt to grow old fashioned quite suddenly." |
22nd Jan 2023, 5:39 pm | #10 |
Octode
Join Date: May 2007
Location: Liss, Hampshire, UK.
Posts: 1,875
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Re: Revox B77.
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22nd Jan 2023, 6:09 pm | #11 |
Moderator
Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 7,225
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Re: Revox B77.
That is where your problem lies
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22nd Jan 2023, 11:14 pm | #12 |
Diode
Join Date: Jan 2023
Location: Chicago, Illinois, USA.
Posts: 8
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Re: Revox B77.
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22nd Jan 2023, 11:20 pm | #13 |
Diode
Join Date: Jan 2023
Location: Chicago, Illinois, USA.
Posts: 8
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Re: Revox B77.
Thanks, ordered new Hichicon 2200uF 60V caps, one cap I installed is faulty testing shows shorted. I got a cap kit from Revox on line, one I guess was a dud. Did not test them before installation. will replace both with Gold audio quality will see the results.
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23rd Jan 2023, 6:06 pm | #14 |
Diode
Join Date: Jan 2023
Location: Chicago, Illinois, USA.
Posts: 8
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Re: Revox B77.
Caps replaced, still same problem as soon I release play button LED's go off and recording stops voltage is 24.09V This is MYSTERIOUS?!?!?
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24th Jan 2023, 12:40 am | #15 |
Moderator
Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 7,225
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Re: Revox B77.
What is the voltage of the 24V unregulated supply off load? it should be around 28V and around 24V when a function is selected.
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