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Reel To Reel All discussions pertaining to reel to reel decks. These include general usage, recording, playback, and service questions. For subjects related to tape itself, see the Open Reel subforum under this one. Obscure service subjects that don't quite fit go in the Help and Do It Yourself subforum.

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  #1  
Old 01-07-2017, 10:44 AM
jllaw jllaw is offline
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Revox A77 Recording Problem - Help!

When recording from a source such as Phono, the channel meter shows recording and moves with music. However, when I rewind back, and play, i just hear "Static", no music?? Might someone please advise if I am not operating it correctly?
Thank you in advance
Jim in Montana

I failed to mention, when I purchased the recorder, previous owner indicated all functions worked perfectly, including recording.

Last edited by jllaw; 01-07-2017 at 10:51 AM. Reason: Failed To Mention.
  #2  
Old 01-07-2017, 10:55 AM
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Zombie Zombie is offline
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Have you pressed the buttons left and right of the VU meters?
  #3  
Old 01-07-2017, 12:16 PM
Perryed Perryed is offline
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If you are new to reel to reel, these can be tricky to get all the buttons and settings right. Get a manual and make sure everything is set right. You can download a free manual at Hifiengine. Also would help to know where you had all the settings when this happened. Both during recording and playback. Were you monitoring thru headphones? Good luck!
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  #4  
Old 01-07-2017, 01:14 PM
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bcschmidt bcschmidt is offline
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as zombie said, and make sure your tape is shiny side up!
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  #5  
Old 01-07-2017, 04:48 PM
Challenger604 Challenger604 is offline
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Reelspin

Hi there!
I might be boring again but! If an A is not re-capped!! Re-cap it!! Period!

Could be oscillator or input amp! But I would be re-capping and also change all trimpots!
Trimpots don't hold 40 years!
Have fun!
C
  #6  
Old 01-08-2017, 07:18 AM
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bcschmidt bcschmidt is offline
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yeah, its best to just grab a cap and trim pot kit from nagravox, those pots literally crumble when you bump them, or turn them.
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  #7  
Old 01-08-2017, 08:08 AM
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and don't forget, we sell Revox upgrade kits as well, VERY competitively priced and based here in the US of A!
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  #8  
Old 01-08-2017, 10:11 AM
GeoffB17 GeoffB17 is offline
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I'm not familiar with Revox machines...

Most machines of this type (certainly mine work this way) but there is some type of Source/Tape switch. Your syptoms COULD be consistent with something simple like it was set to Source when you were recording, but never got swapped to Tape when playing back! This switch also allows you to listen to what's being recorded on tape while you're recording, to ensure that you ARE recording something.

There may be one general switch, or separate switches for each track.

If you listen to Tape while recording, if there's nothing again, then something IS wrong! Oh, if the output level is low? But on my machines you'd need that up to hear the source while recording, but Revox may be wired differently?

Geoff
  #9  
Old 01-09-2017, 11:08 AM
jllaw jllaw is offline
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Thanks to everyone for your suggestions:
I am not new to reel to reel, however, new to Revox. My previous deck was a Pioneer, however, the Revox is a bit more complicated. I do have a manual, and, I will try again, checking all the settings, and, I will repost with the settings I used. I have to believe it is a setting that I am not using properly. My Preamp is an Audionics, and has settings for two tape decks, withe dub, and program switches. I have a great/old cassette deck and it works perfectly.
Thanks again
Jim in Montana
  #10  
Old 01-09-2017, 11:18 AM
Perryed Perryed is offline
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You stated that the seller said everything worked, but this wouldn`t be the first time that was a very optimistic statement. Just sayin` Where was it purchased? Do you have the option to return it?
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  #11  
Old 01-09-2017, 01:18 PM
Audiomayvin Audiomayvin is offline
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Hi!
Have you tried any other tape that has known recording and has it played?
What I have seen too often is the front of the head shield with a shiny track implying that the tape was threaded in front of the shield!
Could that be your issue?
One test- hold the transport in playback and touch the wires on the playback head. You should get a big buzzing sound.
All the best,
Leon(The Audiomayvin, Montreal(514)739-5403)
  #12  
Old 01-09-2017, 06:19 PM
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Reevocks Reevocks is offline
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Quote:
Originally Posted by jllaw View Post
When recording from a source such as Phono, the channel meter shows recording and moves with music. However, when I rewind back, and play, i just hear "Static", no music?? Might someone please advise if I am not operating it correctly?
Thank you in advance
Jim in Montana

I failed to mention, when I purchased the recorder, previous owner indicated all functions worked perfectly, including recording.
Jim:

Audiomayvin made a very good suggestion; playing a known good tape. You stated you have a manual, that's good. Having restored 6 A77's including heads replacement, my experience with the venerable A77 is more than casual. After reading your original post, I looked at a schematic and while there are a few causes to your problem, one stands out and is an easy fix. I won't go into that now pending your trying an known good tape.

Another member made mention of recapping and please do take him seriously.

Robert
  #13  
Old 12-19-2017, 11:00 AM
jllaw jllaw is offline
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Additional A-77 Issue

When recording from a source, such as Phone, both record meters work, and move with the volume control to set for best recording. However, when on PlayBack, the Right channel is weak! The left channel is very strong, however the right channel has very low volume.
I do check to make sure both the switches next to the view meters are pressed down.

Any ideas as to what may be causing this issue?

Thanks,
Jim
Montana
  #14  
Old 12-19-2017, 11:33 AM
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jan_stevns jan_stevns is offline
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Quote:
Originally Posted by jllaw View Post
Any ideas as to what may be causing this issue?
Maybe a simple thing as dirty heads - do examine them carefully
  #15  
Old 12-19-2017, 11:53 AM
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steerpike steerpike is offline
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Quote:
Originally Posted by jan_stevns View Post
Maybe a simple thing as dirty heads - do examine them carefully
^^^ could well be that, and getting a really good view is so difficult on an A77.
  #16  
Old 12-19-2017, 12:05 PM
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jan_stevns jan_stevns is offline
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Quote:
Originally Posted by steerpike View Post
^^^ could well be that, and getting a really good view is so difficult on an A77.
Sure is - a dental mirror is a must have if you have a A77
  #17  
Old 12-19-2017, 12:32 PM
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Tapetech Tapetech is online now
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Revox found out that head cleaning was a problem for the A77, so at one point they started to include a cleaning kit with all new decks. It had angled cleaning sticks and a dental mirror.
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  #18  
Old 12-19-2017, 02:47 PM
jllaw jllaw is offline
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Recording Issue

Thanks for the suggestion. I did try to clean the heads, however, not sure I was successful. I do not have a dental mirror, so I will invest in one and try again. Have you been able to use a normal Cotton Swab to clean, or should I try for something else? My old Pioneer was very easy to clean, and to see as I was cleaning.

Thanks again,
  #19  
Old 12-19-2017, 02:58 PM
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Post close-up, in-focus photos of the heads.

Also tell us if both channels sound good when playing a good tape.
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  #20  
Old 12-19-2017, 10:39 PM
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Reevocks Reevocks is offline
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Quote:
Originally Posted by jllaw View Post
When recording from a source, such as Phone, both record meters work, and move with the volume control to set for best recording. However, when on PlayBack, the Right channel is weak! The left channel is very strong, however the right channel has very low volume.
I do check to make sure both the switches next to the view meters are pressed down.

Any ideas as to what may be causing this issue?

Thanks,
Jim
Montana
I'm assuming both record level controls are at approximately the same position of rotation. If they are, the problem seems to be in the driver amplifier of the right record board. With equal signals on both channels and both record level controls at the same position, the VU meters will respond equally as they are driven by the VU meter amplifiers on the record boards.

If you're lucky, there may be some dirt on the record head. It doesn't take much to inhibit the weak signal of the record head.

Verify or confirm the above and if necessary, we can go further.

One more thing, if you have a known good tape, verify the both channels play similarly loud. This will verify the playback amps.
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