VPI-HW19 first model


Just got this turntable out of estate sales. Has original Sumiko MMT arm on.

The owner stated he changed motor 2 years ago and it's Hurst 600rpm motor.

My issue there: This motor is LOUD and it's clearly heard through the record surface. This motor seems to be a stepped synchronous motor. I tried to damp this motor mount bracket with silicone gasket and it still transfers too much vibrations onto the platter and arm boards.  The original owner also supplied me with original motor that is still functional.

Tried to contact VPI -- no luck/no response after numerous e-mails (are they still around or gone?)

Tried to contact Hurst -- no working phone or e-mail listed on their site.

 

czarivey

With the output shaft clip removed along with the bottom friction-fit cover removed, just push the output shaft into the motor housing and remove from the bottom of the motor.

Identical to the top washer/bushing, you’ll find a matching washer/bushing at the base.

A good solvent cleaning and removal of grease will allow you to check its conditions including shaft wear. If OK, reload with a good synthetic grease such as Royal Purple® Ultra-Performance Grease and reassemble 👍

Setting the in/out output shaft play is very easy during reassembly if you have the VPI output shaft collar w/set-screw. Just a perceptible amount of play is perfect.

Experience rebuilding these has clearly shown that the motors NOT coupled to an absorbent metal are more likely to be worn beyond repair to due over temperature wear. Mechanically coupling these Hurst motors is imperative to optimal performance.

While the mechanical aspects of the motor are critical, don’t underestimate the electrical performance!

Jan @ VPI did a fair amount of practical research into the vibrational performance of various motor capacitors. The newer high voltage caps are readily available and highly recommended if you’re NOT using an external controller such as their SDS which can “cog” the motor when line voltages are lowered. (Line level voltages are essential for properly conveying Pace, Rhythm and Timing on high mass systems IMO.)

I just tested it with old cap hard wired to see if it’s spinning before actually starting disassembly.

I’ll try to see if this old motor with the new cap after some surgical clean-up and lube will run better than newer one.

Will put myself onto test on how good or lousy am I by trying to make from crap a cake. :-)

Best of luck! You’ve got nothing to loose 👍

To emphasize the importance of mechanical grounding, press an edge of the motor frame against something of mass such as the top of your work table with it turning. Feel what happens when the vibration can drain off 😳

@boothroyd , I finally got a grip on paste dielectric synthetic grease.

From what I see I need to really pack this anchor all the way to the top literally squeezing it over the shaft right into basket magnet. It might be a factor of consuming more power from the wall due to the thick viscosity, but it really should reduce vibrations. I really don't care if motor is loud, but all I care is about typical vibrations to any synchronous AC motor that shouldn't be used as a turntable motor at all. It's more good to power tools like grinder than turntables.