Hi,
recently I acquired a Revox B791 turntable in a decent condition (it looks like new). In operation it behaves very fine: It runs smooth and without any unwanted noise, and the cartridge, an ELAC with an aftermarket stylus named D793, sounds just amazingly. The best cart I've ever owned, btw.
The unit isn't withouit any issues, though: The cue operates veeery slowly in both directions, and right at the end of the record, when the linear arm's cartridge transport starts to move the cart assembly outward, the needle just slides some millimeters over the groove. This doesn't exactly sound delightful, but also might lead to both record and stylus damage. At least I'm afraid of that.
As the service manual doesn't give any hint of what to do in this case, where should I look for the reason? Is it a mechanical or an electronical issue, or both?
Best regards!
recently I acquired a Revox B791 turntable in a decent condition (it looks like new). In operation it behaves very fine: It runs smooth and without any unwanted noise, and the cartridge, an ELAC with an aftermarket stylus named D793, sounds just amazingly. The best cart I've ever owned, btw.
The unit isn't withouit any issues, though: The cue operates veeery slowly in both directions, and right at the end of the record, when the linear arm's cartridge transport starts to move the cart assembly outward, the needle just slides some millimeters over the groove. This doesn't exactly sound delightful, but also might lead to both record and stylus damage. At least I'm afraid of that.
As the service manual doesn't give any hint of what to do in this case, where should I look for the reason? Is it a mechanical or an electronical issue, or both?
Best regards!
Some of the actions are controlled by micro switches but as they initially function its then down to the equipment that actually moves in response .
I don't like the blow ups not very detailed it talks of "drive string " which I take moves the arm across the record on two parallel "bars " but the height is controlled by another mechanical apparatus which again is not detailed .
I would say --lubrication and check the springs it doesn't matter how good the electronic signals are if the actual actuating mechanism is faulty.
I don't like the blow ups not very detailed it talks of "drive string " which I take moves the arm across the record on two parallel "bars " but the height is controlled by another mechanical apparatus which again is not detailed .
I would say --lubrication and check the springs it doesn't matter how good the electronic signals are if the actual actuating mechanism is faulty.
you are lucky 😎
a good duster cleaning followed by a lubricant (not altering plastic) may be a starting point. With revox/studer unused micro-swiches may gently mod tripping point. Metal gear is not bent but inside bilame contacts may switch later....
I have had a B790 for a long time but it is currently resting on the shelf and yes it moves slowly when using the cue buttons and the tone arm should be adjustable so that the cartridge is a little higher up using one of the screws on the tone arm. The manual is not so informative but shows where to find them.
Solved!
A telephone call with the German Revox service department helped me to get rid of the issue 🙂. There's a pneumatic damper next to the cue solenoid, consisting of an aluminium cylinder, a piston within it and a connecting rod. I just had to twist this cylinder somewhat in order to open a small bore at it's bottom a little bit more, hence allowing the air to get in and out more rapidly.
Best regards!
A telephone call with the German Revox service department helped me to get rid of the issue 🙂. There's a pneumatic damper next to the cue solenoid, consisting of an aluminium cylinder, a piston within it and a connecting rod. I just had to twist this cylinder somewhat in order to open a small bore at it's bottom a little bit more, hence allowing the air to get in and out more rapidly.
Best regards!