You are here

Log in or register to post comments
CaptainVinyl1
CaptainVinyl1's picture
Offline
Last seen: 4 years 11 months ago
Joined: Mar 15 2012 - 9:00pm
new platter for old Pro-Ject

I have enjoyed my Pro-Ject 1.2 for many years now, even though the wiring, motor mount, and tonearm have been compromised and jury-rigged to enable it to continue to function. But to my ears, it still sounds great. Outfitted with an Ortofon 2M Blue, and fed through a Bellari VP 129, it is always a sublime pleasure to drop the needle on one of my favorite LPs. Those albums that I also have on CD still get as much or more play than the CD. The only digital version I truly believe trumps the vinyl is the DVD-Audio of Emerson Lake and Palmer's "Brain Salad Surgery".

About a year ago I had crafted a plate out of Corian countertop material to replace a shattered microwave oven platter. Then a few months back we successfully obtained a new glass platter for the microwave. This left me with a 1/2" thick disc of Corian approximately 12" in diameter. Hmmmm? I thought. what to do with such a disc. Immediately the thought came that it would at the very least make a cool looking turntable platter, so it was back to the workshop.

The first problem of course was the spindle hole, being a little more than 1/4" but a little less than 5/16". First I drilled a carefully centered 1/4" hole. Then a 1/4" bolt was inserted and a nut tightened down on it, firmly clamping the Corian disc to the bolt. The bolt was inserted into the drill press chuck and the drill run at lowest possible speed. Using various abrasive devises held against the edge of the spinning disc, the overall roundness of the disc was improved. Satisfied with the roundness, that left the matter of obtaining the proper sized hole. I wrapped 120 grit sandpaper around the 1/4" bolt and again inserted it through the hole, using the bolt as an axle for rotation.

Spinning the disc around the sandpaper wrapped bolt slowly increased the diameter, and after a while I knew it was close. Frequent test fittings over the spindle after every couple of revolutions eventually resulted in a perfect fit. I now had a nice round disc with a proper sized hole. All that was left was to hollow out the central part of the bottom to allow it to sit properly over the Pro-Ject sub-platter, and to then clear the top of the motor. The final product is just the right height for the typical LP so no VTA adjustment has yet been made.

The final platter only weighs about half as much as the original metal platter. But if you give the metal plater a sharp knock with something, it rings like a bell, whereas the Corian produces just a dull thud. That was encouraging. I regret that I have yet to give it a full audition. I have so far only listened to "Phasors on Stun", the first track off my most listened to LP, "Black Noise", by the Canadian progressive trio FM. How did it sound? Definitely a little more authority to the bass, undecided on the midrange, maybe a tad weaker on the highs. I will continue to test it out, perhaps fiddling with VTA if need be. But the pure white Corian against the flat black plinth sure looks dope, as my kids would say

I welcome any comments if this has been tried before

David Harper
David Harper's picture
Offline
Last seen: 19 hours 5 min ago
Joined: Aug 7 2014 - 2:23pm
Platter

Holy Moly! Thats quite a project!
I bought a new Project table but I didn't like the way the mickey-mouse looking anti-skating device had this stupid looking piece of little wire suspending the weight, so I removed it and found a chunk of solid steel, drilled a hole in it and inserted a steel shaft, with a bend at the end, spray painted it flat black, and it looks awesome. Plus it's better because I can reposition it however I want.

CaptainVinyl1
CaptainVinyl1's picture
Offline
Last seen: 4 years 11 months ago
Joined: Mar 15 2012 - 9:00pm
update on dorian platter

Spent the most of the afternoon listening to various genres of music, and the Corian platter definitely makes a positive difference. The difference is less apparent on the hard rock albums, (Blue Oyster Cult, UFO, etc..) but was quite striking on the Ry Cooder/ Manuel Galban "Mambo SInuendo" collaboration, with greater detail on the bass as well as Galban's funky Cuban surf guitar sound. Also striking was the low-level detail in the first thirty seconds of Alan Parson's "I Robot". Side one of the Who's "Quadrophenia" was breathtaking as always, but slightly mores this time around.

None of the records I listened to sounded worse,in my opinion. I will continue to evaluate deeper into my collection.

Regarding the Pro-Ject hanging weight anti-skate system; mine fell off and was lost years ago during one of my turntable repair ventures, si I have done without it now for at least 5-6 years. Can't say that I miss it.

David Harper
David Harper's picture
Offline
Last seen: 19 hours 5 min ago
Joined: Aug 7 2014 - 2:23pm
wieght

I tried using the table without the weight but sometimes when the stylus got to the end of the record it would jump out of the groove and skate across the paper label until it hit the spindle. Now THAT'S skating force.

  • X