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128.48.7.70
Hi:
One of my ReVox A-77-III recorders now refuses to shut off when tape runs out and the lamp is still operating properly.
I assume that the sensor opposite the lamp is shot. Does anybody know where a replacement sensor can be found these days?
Or, does anybody have a good but used one to sell me?
Thanks in advance!
Richard Links
Berkeley, CA
Follow Ups:
Richard, Richard, Richard. :)
Are you saying that you didn't pull the bulb out years ago, like every other pro Revox user? ;)
Try Steve Smith in Nashville. I don't have his phone # handy, but he's in Madison, TN. He refurbished my Mk IV 3-4 years ago and did a great job. He's easy to find (411, Google, call a couple studios which have Studers).
hth
Hi, Inmate51!
No, I never thought about removing the lamp.
Let me tell you something which might possibly amuse you.
I had a friend who once used his A-77 to make live recordings. He warned me to watch out when setting up an A-77 so the machine was facing AWAY from the audience at all times.
Why was this?
Because one time while he was recording in an auditorium, he left the metal tape patch cover flipped down and his deck was tilted slightly toward the audience. When someone in the audience used a flash attachment on a camera, the strobe light reached his deck and the brilliant flash actually penetrated the open gate of his machine, reached over the tape path and struck the sensor, literally shutting him down in the middle of a live event.
Lesson learned the hard way!
Also, even if you were to remove that lamp, if any bright flashing light were to reach the sensor, the same thing would occur.
Actually, don't you want your machine to automatically stop the reels from turning when tape runs out, especially if you operate the machine unattended for some time?
Richard Links
Berkeley, CA
"shutting him down in the middle of a live event."
Ouch!!
As far as taking the lamp out vs. keeping it in to auto-stop the machine, I've always preferred to have it out. With the amount of editing I used to do for getting tapes ready for transfer to LP, it was just easier to not have the machine going into "stop" every time I'd pull the tape out of the path. (I'd have the reel motors off, and the machine in FF or FR so I could rock the tape to an exact point to mark for editing.)
Hi, Inmate51:
I see your point!
Richard Links
Berkeley, CA
Try contacting JM Technical Arts in Nashville, Tennessee (they have an abbreviated web site with contact info - do a search). They are the last authorized Revox repair center in the U.S., I think, and I recently bought some parts for my PR99 from them.
John C.
Thanks!
I'll check it out.
Richard Links
Berkeley, CA
Rich
I have an B77 and an old A77 that died last year..What does the part look like? I think you may be able to improvise something if you cant find one.I think studer may have the part tho being they are a harman international company.
Hi, Michael:
The optical shut off sensor is mounted with one screw and sits opposite the "naked" shut-off lamp.
In other words, just to the right of the feed-side rolling bearing and just to the left of the erase head assembly is where this black shrouded optical sensor sits.
It has only two wires, which are soldered to little posts.
I took out one of my other A-77s this morning and took voltage readings right from the sensor side and in the dark, I got a reading of perhaps 14.2 volts dc. This decreased slightly when illumination struck the cell.
That is the working one.
Please take a look and see if you have one available.
I also do not know if the shut-off problem might be associated with some other problem with the deck right now.
Thanks in advance!
Richard Links
Berkeley, CA
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