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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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24th Oct 2019, 4:35 am | #1 |
Diode
Join Date: Apr 2019
Location: Bowral, New South Wales, Australia
Posts: 5
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Revox A77 Tape loose
I recently replaced components on the speed control board which fixed the speed control problem I was having.
However now the take-up (right hand) reel is not maintaining tension on the tape. Any clues? ken |
24th Oct 2019, 12:22 pm | #2 |
Triode
Join Date: Aug 2017
Location: Amsterdam, Netherlands.
Posts: 15
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Re: Revox A77 Tape loose
I think you should also replace parts on the relay board
Jack Marotick |
24th Oct 2019, 2:57 pm | #3 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Revox A77 Tape loose
Is the rewind motor providing back tension in play mode?
Lawrence. |
24th Oct 2019, 9:47 pm | #4 |
Moderator
Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 7,219
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Re: Revox A77 Tape loose
Check that the MOTORS OFF button is not pushed in.
Check continuity across the switch contacts |
29th Oct 2019, 4:28 am | #5 |
Diode
Join Date: Apr 2019
Location: Bowral, New South Wales, Australia
Posts: 5
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Re: Revox A77 Tape loose
Many thanks for all of your replies.
Here is what is happening in each mode:- Play Take up spool not keeping tension on the tape. Also it only works whilst the button is pressed (i.e not latching) Rewind Working O.K. but it only works whilst the button is pressed (i.e not latching) Fast Forward Rewinds at what appears to be 'Play' speed. Again it only works whilst the button is pressed (i.e not latching) ken |
29th Oct 2019, 9:37 am | #6 |
Dekatron
Join Date: Aug 2006
Location: Madrid, Spain / Wirral, UK
Posts: 7,484
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Re: Revox A77 Tape loose
Remote plug loose, or wire disconnected there?
__________________
Regards, Ben. |
30th Oct 2019, 12:31 am | #7 |
Moderator
Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 7,219
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Re: Revox A77 Tape loose
As Ben says, check that the remote dummy plug is fitted. if it is check the End Of Tape sensor and the two transistors connected to it.
I also suggest you replace the two 4.3uF reel motor run capacitors and the 3.5uF capstan motor run capacitor. You can get them from Revox online and/or Nagravox |
30th Oct 2019, 6:41 am | #8 |
Diode
Join Date: Apr 2019
Location: Bowral, New South Wales, Australia
Posts: 5
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Re: Revox A77 Tape loose
Thanks again everybody
I must admit I didn't realise that the dummy plug was part of the circuitry so putting that back fixed the latching problem. Thanks. I will purchase the three capacitors as suggested Michael and let you know how that goes. ken |