Disconnect all wires.
- Measure the height from top of rubber belt down to top of gyrodeck pod (10,5mm). This distance is needed when adjusting height of new pulley.
- Remove rubber belt from pulley.
- Remove pulley (small screw)
- Remove nut holding past motor Axel to pod (not present on some decks)
- Unscrew Allen screw on top of pod.
It is now feasible to lift up pod.
On some Michell decks the motor is encased by rubber – this needs to be sliced off as a last resort but it may be possible to lever the rubber out along with the motor – the rubber is held in by a “lip” and glued to the motor pod.
- Cut wires leading from the socket (under the deck) at the switch screwed to the top of the pod (blue/green/brown). These wires need to be as long as possible. Then cut the wires leading to the motor from the switch. The old motor can now be removed. The switch can either be left or removed. It is not going to be used anymore as the on/off switch is located in the new Origin Live control box.
- Remove top of pod from casing.
- Top of pod consists of 2 plates bonded together by means of rubber washers It is necessary to use force to part these plates. Smallest plate is redundant.
- Top plate for new motor is removed from motor by unscrewing 3 small screws on top.
- Drill and tap a hole in top pod plate.
NOTE: on later Michell pods the top plate does not split off the main pod but the principle for fitting are similar.
- Centre top motor plate to top pod plate and drill hole in motor plate through the already drilled hole.
- Fix to plate to each other with one screw and nut.
- Fix motor to its original position
- Solder blue wire to positive motor lead (white line) and brown to negative lead.
- Assemble motor, casing and pod then fasten the Allen screw
- Install pulley and rubber belt. Push pulley down to same distance as measured under item 1. Rubber band must run level between pulley and turntable.
- Existing power supply connection can be used to supply power to the new motor. Cut wire supplied with motor .Connect black/white lead to where the blue lead was connected. Connect the black lead to where the read lead was connected. Connect other end to motor control box.
You have now finished fitting the motor.
Thanks for your help in transforming my old Mk III Michell Gyrodek both with the just completed motor upgrade and the earlier arm and Aurios pro bearings. I thought I’d write to recount the story in rather more detail.
Originally the Gyrodek had a Linn LVII Ittok arm and despite running on 1.2 Aurios bearings (which had improved things significantly) it had been struggling to keep up with the digital front end. I had been trying to decide on a complete replacement for the Gyrodek thinking it had reached the end of its useful life in the context of the rest of the system which had undergone major improvement.
The first change last year was an OL Illustrious arm to replace the Ittok – and a huge improvement. The second was Aurios Pro bearings which seemed to transform whatever they were placed under. To my surprise they were much more effective under the Gyrodek than the 1.2 bearings – and that is where they have stayed. With the Pro bearings under the Gyrodek analogue replay was clearly superior to CD replay, roughly on a par with SACD.
Meanwhile the old Gyrodek AC motor was chugging along on what seemed to be its last legs. Was it worth spending money on a DC replacement or should the whole deck be replaced was the difficult question. Finally the motor failed and I perhaps reluctantly decided to try an OL Advanced motor kit plus transformer and 200 motor upgrade.
I’d read many reports in magazines and on the net saying how much better DC motors were – and clearly with the Advanced unit it was true. So much so that the next day I wanted to try an Ultra power unit to compare it. It was immediately obvious that the Ultra unit outperformed the Advanced by a margin that more than justified the price difference – and things have improved further over several days since as things have run in. Overall the effect of the Ultra kit/transformer/200 motor is stunning. I could not have imagined that the effect would be so big – vinyl now clearly demonstrates the deficiencies in CD replay and beats CD/SACD by a really wide margin – on an old deck which I had thought was well past its replacement date. Interestingly the effect of adjustment in tightness of the tonearm bottom nut (barely tightened by hand seems best), record clamp device and arm height/VTA now have really marked and obvious effects; when set about right things sound really glorious.
Although the full Ultra/200motor/transformer upgrade cost nearly as much as a new Gyrodek SE I think the result is actually very good value for money compared to other things in my system. It seems to have enabled the old Gyrodek (with the Illustrious arm and Aurios Pro bearings) to perform so far beyond my expectation – and there’s still room for more improvement with maybe a new Michell platter and Gert Pedersen suspension upgrades for it too. My only regret is not having replaced the AC motor sooner!
And to put the above remarks in context….
Sony 777ES SACD player (on Rollerblock supports)
Audio Synthesis DAX Decade DAC via Kimber Select KS-2020 digital interconnect.
Michell Mk III Gyrodek (on Aurios Pro bearings) + OL Illustrious arm + Van den Hul Frog
Musical Fidelity 308 pre amp
2 x Musical Fidelity 308 power amps
Celestion 6000/600 system speakers modified with internal Bybee filters; 600 components
sitting on Aurios 1.2 bearings plus tungsten balls; Tannoy supertweeters.
Speaker cabling – 600 cable Van den Hul ‘The Third’,
6000 bass cable Van den Hul Revelation. Interconnects – Nordost valhalla (modified with Eichmann bullet plugs)
Kimber Select KS-1030
Mains leads – Russ Andrews reference
Mains circuit – separate Kimber wired mains ring through separate distribution box.
Walker Audio SST silver contact treatment.