I recently bought an Oracle premier with a Tri-Planar tonearm. 30 years old, price was right. Well, almost right. There was no speed controller with the turntable. Thought it might show up at a later auction, but no luck.
The motor has a seven pin plug coming off of it. Can anyone build me a 33 rpm controller for this turntable? Can an existing speed controller from any number of other turntables be modified (hot-Rodded if you will) to run this turntable?
Otherwise I have a nice piece of sculpture.
These controllers are none existent unless one of you knows of one for sale.
Thanks for reading. Any and all help is greatly appreciated
The motor has a seven pin plug coming off of it. Can anyone build me a 33 rpm controller for this turntable? Can an existing speed controller from any number of other turntables be modified (hot-Rodded if you will) to run this turntable?
Otherwise I have a nice piece of sculpture.
These controllers are none existent unless one of you knows of one for sale.
Thanks for reading. Any and all help is greatly appreciated
If the motor is AC synchronous and just needs a generated 60Hz output, then you could use an old Linn Valhalla. You just need to change the oscillator chip on the board, as most are configured for 50Hz operation.
jeff
According to the info I can find the motor is a 3 phase bldc motor from Papst. I can't find any detail, but its probable that the SG4 DIY 4 Phase Sinewave Generator for Turntable Motor Drive - diyAudio
would allow for a suitable substitute.
would allow for a suitable substitute.
If it is the same Papst motor as used in model Delphi you just need a supply
and maybe some pot switching if more than one rotation speed is required.
and maybe some pot switching if more than one rotation speed is required.
I would just contact Oracle thru their website. Looks like they have all kinds of updated electronics.
Parts & Upgrades | oracle
jeff
Parts & Upgrades | oracle
jeff
Oracle power supply
Thanks everyone.
Vk58: I can get a motor and controller upgrade from Oracle for around $2k. The table is thirty years old and has to be sent to Oracle for the plinth to be drilled for compliance. I have their upgrade catalog. A replacement record clamp is $400. I like the Linn V. route but need to know what I need, as electronics is not my thing. There are two boards on EBay. I know I need a box and a switch and plugs, etc.
as-audio: You are thinking like I am. A box, a seven pin adapter, a switch and a plug. It can’t be THAT hard to make a motor change speeds. My question is what are the seven pins for? I don’t need to know, as long as someone else does. My initial thought was hot rod an exiting speed controller. There are Regas on Ebay for $100.
Have an electronics musical instrument repair here in town. The guy understands everything you are talking about. I can take him the stuff to build it, just need to know what I need to be taking him. So let’s say I buy a Linn board. What else do I need? Do I need to know from Oracle what the seven pins do?
Thanks again so much for your help!
Prewitt
Thanks everyone.
Vk58: I can get a motor and controller upgrade from Oracle for around $2k. The table is thirty years old and has to be sent to Oracle for the plinth to be drilled for compliance. I have their upgrade catalog. A replacement record clamp is $400. I like the Linn V. route but need to know what I need, as electronics is not my thing. There are two boards on EBay. I know I need a box and a switch and plugs, etc.
as-audio: You are thinking like I am. A box, a seven pin adapter, a switch and a plug. It can’t be THAT hard to make a motor change speeds. My question is what are the seven pins for? I don’t need to know, as long as someone else does. My initial thought was hot rod an exiting speed controller. There are Regas on Ebay for $100.
Have an electronics musical instrument repair here in town. The guy understands everything you are talking about. I can take him the stuff to build it, just need to know what I need to be taking him. So let’s say I buy a Linn board. What else do I need? Do I need to know from Oracle what the seven pins do?
Thanks again so much for your help!
Prewitt
As said you need a dc suoply (may even be ac if the rectifier is on board
of the motor). In addition you may add a speed switch and potentiometers
for adjustment. The motor Papst GS38.09 is different from ac sysnchronous
or brushless dc motors. It is possible to find threads about it here.
of the motor). In addition you may add a speed switch and potentiometers
for adjustment. The motor Papst GS38.09 is different from ac sysnchronous
or brushless dc motors. It is possible to find threads about it here.
I have an Oracle table needing parts. What I was quoted was so overpriced to the point where I am contemplating telling them to stuff it, junk it, and buy a VPI just to spite them.
can you provide any part numbers on the motor, and any photos of the underside of the turntable, with the baseplate removed
Re post 8 :the EASIEST WAY TO GET IT GOING IS" to provide a dc supply
for the Papst motor. Nothing more is required if you only need single speed.
The Papst is a "DC MOTOR".
Re post 9 : which "parts" do you need ?
for the Papst motor. Nothing more is required if you only need single speed.
The Papst is a "DC MOTOR".
Re post 9 : which "parts" do you need ?
you can go on their site and download schematics for motor drives. the motor is very possibly the same for most models
I've had a look at Oracle's site and there's quite a bit of info for many of the early Turntables, but little or nothing for the Premiere.
The outboard controller allows push button speed change, and a display of the current speed; unfortunately there are no schematics.
If the motor currently fitted can be identified it is possible that a functional controller/PSU might be created, but without even that information your best bet is probably to either send the TT back to Oracle for a 'upgrade', or look for an alternative motor/controller setup.
The outboard controller allows push button speed change, and a display of the current speed; unfortunately there are no schematics.
If the motor currently fitted can be identified it is possible that a functional controller/PSU might be created, but without even that information your best bet is probably to either send the TT back to Oracle for a 'upgrade', or look for an alternative motor/controller setup.
if yours is belt drive, it is probable the Mark II III or IV configururations of the other tables from the same period use the same motor and driver board circuit.
it looks like a DC motor with frequency genereation, it produces a frequency proportional to the RPM of the motor. Motor rpm could be 300 - 1000 for belt drive operation.
it looks like a DC motor with frequency genereation, it produces a frequency proportional to the RPM of the motor. Motor rpm could be 300 - 1000 for belt drive operation.
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According to the little information available the Premiere uses a 3 phase Papst motor, the schematics for other Oracle tt's indicate their motors as being 2 phase design;so probably not the same sadly.
In order to be of any practical help we really do need part numbers for the motor, and pics would be a big help.
In order to be of any practical help we really do need part numbers for the motor, and pics would be a big help.
I have a complete Première, which I’m trying to fix. The Papst motor is 934 3909 003. There are some other digits below that number, but partly obliterated by a red-painted shallow drill hole (balancing?), reading 2??84. I’ve tried to find more info on this motor, on Papst’s website and Google, but not found any reference to it. Note it is connected by 7 wires, which may be a big clue to someone who knows their motors!
I have measured the resistance between each of the pins (of the 7-pin DIN plug at the controller end of the cable), and can give details if anyone’s interested. Some measurements seem unstable and polarity-sensitive (maybe due to a capacitor?).
My digital electronics seem to work ok, as it shows speed (33.33 or 45) and responds appropriately to button presses. The motor runs, but is too weak to self-start or keep the platter turning. One of the two driver transistors is running much hotter than the other. I’ve started to map out the circuitry, but it’s not making a lot of sense yet!
See pics for what they’re worth. I hope this is some help, and I can provide more detail if anyone’s interested. If anyone has anything to help me on my way I’d be glad to hear!
I have measured the resistance between each of the pins (of the 7-pin DIN plug at the controller end of the cable), and can give details if anyone’s interested. Some measurements seem unstable and polarity-sensitive (maybe due to a capacitor?).
My digital electronics seem to work ok, as it shows speed (33.33 or 45) and responds appropriately to button presses. The motor runs, but is too weak to self-start or keep the platter turning. One of the two driver transistors is running much hotter than the other. I’ve started to map out the circuitry, but it’s not making a lot of sense yet!
See pics for what they’re worth. I hope this is some help, and I can provide more detail if anyone’s interested. If anyone has anything to help me on my way I’d be glad to hear!
Attachments
P.S. selsync has a photo of the inside of the motor in thread ‘Oracle Premier Motor’ Oracle Premier Motor
This motor is known as Papst GS 39 and was optimised for high class cassette
tape drives. It is a very suitable motor.
Be careful when taking measurements, because the Siemens hall sensor seems
to be unavailable for a long time.
At first the supply has to be checked, nominal 24 Vdc.
See also here Oracle Premier Motor
tape drives. It is a very suitable motor.
Be careful when taking measurements, because the Siemens hall sensor seems
to be unavailable for a long time.
At first the supply has to be checked, nominal 24 Vdc.
See also here Oracle Premier Motor