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Old 5th January 2007, 07:13 PM   #1511
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It is 901. Do you have any experience with VTA and tracking force?

I still have Maplenoll Ariadne to modify and expect it to be even better than Oracle; as to Oracle, I never liked the original design and I simply had to do some changes
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Old 5th January 2007, 07:15 PM   #1512
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The base uses the original acrylic plate, 3/4 aluminum and two 0.25 brass plates. The original control box was also nicely integrated.
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Old 5th January 2007, 11:53 PM   #1513
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Quote:
Originally posted by Peter Daniel
It is 901. Do you have any experience with VTA and tracking force?
I find I'm around 1.95g on tracking force. VTA, (actually SRA), varies per disc, but I find starting with the base of the cart parallel to the record is close, then it's by ear.

-RT
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Old 12th January 2007, 02:07 AM   #1514
DaveM is offline DaveM  United States
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I have a question about heat sinking. I am building up 3875 kit. Actually it has been up and running for about a year and is now facing being enclosed. I found amongst my pile of scraps and parts a piece of 6" OD 1" wall pipe. The steel is really low grade, (sparks and flaming chips when it is cut) but it does clean up nice. So, I was wondering if I will have sufficient heat sinking if I mount the chips to a piece of .375" plate that is press fit into a 6" OD 1" wall 5" tall piece of pipe. Initially I was only going to house the power supply in the pipe, but I have realized that I have room for all of it. I will probably shield the transformer with some copper foil I have kicking around. Here is a pic of the parts and pipe.

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DaveM
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Old 12th January 2007, 05:13 PM   #1515
DaveM is offline DaveM  United States
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Pic did not post. Try, try again.
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Old 12th January 2007, 05:59 PM   #1516
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It will probably work, but thermal release efficiency will be compromised by steel as a material, and also by substantial mass of the whole thing. Depending on how much you will be pushing the amps (volume and load), it may get only slightly warm, or may reach 40-50 deg and stay there. I was using brass rod to mount the chip (2" dia , 8" long and it was acting as heat tank, storing thermal energy, but not releasing)

Since you have it already made, it's worth trying anyway.
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Old 12th January 2007, 06:28 PM   #1517
DaveM is offline DaveM  United States
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I have some brass bar stock sitting around as well. I think I will add a piece of brass to the top cover and mount the chips to the brass. At least this way the heat transfer to the brass is pretty good and the thermal contact area to the steel will be vastly larger than the chip surface. It can't do anything but help.

Thanks for the insight.

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Old 12th January 2007, 10:02 PM   #1518
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You can find the numbers here: http://hyperphysics.phy-astr.gsu.edu...les/thrcn.html

Copper would be best.
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Old 14th January 2007, 12:48 PM   #1519
Mick_F is offline Mick_F  Germany
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It also critically depends on your supply voltage. A supply below +-30V will heat up the chips significantly less than e.g. 35 or 40V.

Mick
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Old 14th January 2007, 03:48 PM   #1520
DaveM is offline DaveM  United States
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Looking a bit closer at that chart, I will be better off using aluminum with a good bit of thermal paste between the steel and aluminum to prevent issues with the dissimilar metals. I always thought that brass was a better conductor than aluminum. That was defiantly a misconception.

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Dave
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