Maybe a phone call to SOTA?
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SOTA had inquired about producing the Eagle PSU that would be compatible with existing 120VAC synch motors and they are free to pursue that option if it makes sense. When I originally discussed this with Christian, we came to the conclusion that it made more sense to offer the 3 phase Condor PSU matched with a MUCH better motor for $725, than to offer a good PSU for $600 to drive a mediocre motor.
The RR tach is offered as a stand-alone option for use on any table. Check with SOTA for details, but I believe the motor will be offered as an upgrade into existing plinths/SAMAs as well as with a SOTA SAMA (stand-alone motor assembly).
Why go steerage when you can ride first class for $125 more?
@phoenixengr- Good information(thanks)! I built my own SAMA, installing an original HW-19 motor, in a 16lb, solid slab of brass(base/adjusters/etc, added another few pounds), with just(barely) enough clearance for silicone heat sink compound. What are the dimensions of your 3 phase motor? I’m wondering if it’ll fit my SAMA housing, without further machining.
@rodman99999- You can download the motor spec sheet here:
The mounting holes are nearly identical to the Hurst 59 series motor (within 40 mils on center). The motor has a ¼" shaft, but comes with an aluminum pulley and uses a flat belt rather than multiple round belts.
@slaw- The PBN tach is a bit of a misnomer. The tach counts pulses from a high speed clock (18.518kHz) so it will produce a reading of 33.333 when it takes 1.8S for one platter revolution. However, it is counting the period of rotation, not RPM, so as the platter slows down, the reading will increase and if it speeds up, the reading decreases. The only time the reading is correct is at exactly 1.8S/rev. There is a separate clock for 45 RPM, so the tach must be switched between 33/45. If you can live with those limitations, it is a fairly clever design.
The RR does not need to be turned on or off; the tach comes alive automatically when the platter starts spinning and goes to sleep when there is no activity for 5 minutes. It also has an accumulated playing time counter that can be used to track stylus wear and can be reset when the cart/stylus is replaced.