bang4buck
Super Member
By the way, sorry, of course you told us about that Alex over in the other thread some weeks ago. Do you mean you have little hope of getting it fixed?
Help needed with Michell GYRO Dec Project
- Thread starter Descartridge
- Start date
By the way, sorry, of course you told us about that Alex over in the other thread some weeks ago. Do you mean you have little hope of getting it fixed?
Descartridge
Stereos been berry, berry good to me!
Yes, I am dubious. my technician is dragging his feet.
restorer-john
Addicted Member
You could easily make a PSU for that motor using stuff you might have lying around.
Drive a small 120/240 volt twin tapped primary transformer in reverse with a 50Hz sine and using an old integrated amplifier driving the secondary. The 2 phases will come from the primary CT and the voltage can be set by gradually increasing the volume until you reach the correct operating voltage for the motor (24v?).
The bonus would be you could select any speed by varying your sine wave frequency.
A couple of flyback diodes on the output transistors in the old amp for good measure.
Drive a small 120/240 volt twin tapped primary transformer in reverse with a 50Hz sine and using an old integrated amplifier driving the secondary. The 2 phases will come from the primary CT and the voltage can be set by gradually increasing the volume until you reach the correct operating voltage for the motor (24v?).
The bonus would be you could select any speed by varying your sine wave frequency.
A couple of flyback diodes on the output transistors in the old amp for good measure.
Descartridge
Stereos been berry, berry good to me!
Thanks John
restorer-john
Addicted Member
You are in the US on 60Hz correct? That's why the suggestion of a variable frequency drive. It will 'sync' to whatever you feed it- within reason. You may have to recalculate the capacitor value slightly or remove it alogether.
I would definitely experiment with that before parting it out or splashing out on an overpriced DC motor arrangement.
At a pinch, you could tweak an old cassette deck motor (like a mabuchi EG-500xx series running in the correct rotation CW or CCW). They have a variable speed and usually run around 2400 rpm, but you can slow them right down and still retain full servo characteristics.
I would definitely experiment with that before parting it out or splashing out on an overpriced DC motor arrangement.
At a pinch, you could tweak an old cassette deck motor (like a mabuchi EG-500xx series running in the correct rotation CW or CCW). They have a variable speed and usually run around 2400 rpm, but you can slow them right down and still retain full servo characteristics.
bang4buck
Super Member
Some years ago I was collecting parts for a DIY turntable that never came to be. I found a nice DC motor and brass pulley in a VCR. So that might be another possibility for you. Plenty of $5 VCRs in thrift stores. Not sure how silent those motors are in operation, though.
As for the Alexandria, from what you showed us in the Oracle thread, it seemed much closer to functional than the Michell. We'd love to hear an update over there and see if we can help make it happen.
As for the Alexandria, from what you showed us in the Oracle thread, it seemed much closer to functional than the Michell. We'd love to hear an update over there and see if we can help make it happen.
robbiesd
New Member
Hi Descartridge,
I just acquired a Gyro Dec. It came with some extra parts. I have three brass spring covers, three aluminum spring basees and an AC power supply. Pics attached. I also have two bearings w/spindles, one threaded one not (not pictured). If any of these parts would be helpful to you PM me with a reasonable offer and the're yours.
PS: the seller still has a Zeta arm and I also have the Zeta armboard that Dave at Artech told me also fits the Linn Itock and others that he couldn't remember. I'm going back to see the seller tomorrow. I recall seeing feet in his parts drawer. I'll get them and send you pics of them too. The one I have has, I think, aftermarket spiked feet. If anyone knows anything about these feet I'd love to hear from you. This seller acquired this deck when he lived in England.
I also got the original platter which I'm going to use as a stacked platter on my DIY Lenco, so I also have no use for the original six brass platter supports.
Robbie
I just acquired a Gyro Dec. It came with some extra parts. I have three brass spring covers, three aluminum spring basees and an AC power supply. Pics attached. I also have two bearings w/spindles, one threaded one not (not pictured). If any of these parts would be helpful to you PM me with a reasonable offer and the're yours.
PS: the seller still has a Zeta arm and I also have the Zeta armboard that Dave at Artech told me also fits the Linn Itock and others that he couldn't remember. I'm going back to see the seller tomorrow. I recall seeing feet in his parts drawer. I'll get them and send you pics of them too. The one I have has, I think, aftermarket spiked feet. If anyone knows anything about these feet I'd love to hear from you. This seller acquired this deck when he lived in England.
I also got the original platter which I'm going to use as a stacked platter on my DIY Lenco, so I also have no use for the original six brass platter supports.
Robbie
