Oracle Delphi Mk III suspension gauge - diyAudio
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Old 24th December 2009, 02:44 AM   #1
walrus is offline walrus  Canada
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Default Oracle Delphi Mk III suspension gauge

I have lost my suspension gauge and know that you can make one out of carboard but need the measurements. If anybody can please post it will be greatly appreciated.

Thanks in advance.
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Old 27th December 2009, 10:44 AM   #2
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One part of the u- shaped gauge fits over the suspension pillar and is used to determine proper spring for each pillar. The gauge rests on top of the spring housing and should just touch the top of the centre post when the spring is the correct one. The distance from top of centre post to the top of spring housing is 3/4 inch to 13/16 inch (19 - 20 mm) according to instruction sheet from Oracle. My gauge actually measures 13/16 inch (21mm). This is for turntables serial number 1001 - 5694 according to one page of the instructions, but another page says 1001 - 6798.

There is a wider stepped portion at the bottom of the opening of the gauge which measures 5/16 inch (8.5)mm. On the gauge it is included as part of the 13/16 inch dimension, not added on to it. The instructions say this is for turntables with serial numbers 5695 - 8135, but the other page says 6799-9044, and the drawing doesn't show clearly how this step is used. Perhaps the spring housing is narrower and fits into the step. My Oracles are older so I don't need to use it and don't know about it.

A second part of the gauge is cut to determine the height from the deck to the spring housing after the proper springs have been chosen. Height is adjusted using the top knobs. The bottom of the spring housing should be 13/16 inch (20mm) from the table according to the instructions. At that distance it will rest on the cut out portion of the gauge. My gauge is actually 7/8 inch (22mm).

Altogether there are three measurements. One for older Oracles and one for newer Oracles to select the right spring for each pillar, and a third measurement for final adjustment of height.

If this doesn't help I'll try to figure out how to post an image of the instruction sheet.
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Old 27th December 2009, 06:07 PM   #3
walrus is offline walrus  Canada
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Default Thank you

Thank you so much - that information is very helpful.
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Old 5th January 2010, 09:21 PM   #4
Nanook is offline Nanook  Canada
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Default Oracle suspension gauge...

I have an Alex Mk ll. There are no instrux for setting the suspension correctly and adjusting the springs as necessary.

barmycodger: would it be possible to provide all dimensions? Perhaps a pix, so that I can make my own (and hopefully) adjust my suspension? Or a sketch or whatever is easiest for you to do.


Us Oracle owners need to unite, (as there are evil pro-Linn forces all around us).
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Last edited by Nanook; 5th January 2010 at 09:23 PM. Reason: typos
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Old 6th January 2010, 01:30 AM   #5
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Hi, Nanook,
The suspension gauge and instructions are from an Oracle maintenance kit which I bought a few years ago. The kit has replacement parts such as springs, dampers and drive belt. The label on the box says the kit is for Oracle Mk1, Mk2, Mk3, Mk4, and Mk5 --Delphi, Alexandria, and Premiere. The instructions don't mention the Alexandria and don't show the Alexandria setup. I have never seen an Alexandria except in photos. According to their web site --Oracle Audio - Product -- the maintenance kit is still available from Oracleand there is a photo of what's in the kit.

Vinyl Engine --Vinyl Engine | The Home of the Turntable -- has a library of information about turntables and tonearms. You must register to download documents. I found three PDFs of instructions for the Alexandria. One of the PDF shows setting up the early model but gives no information about the suspension. I guess this is because the tonearm was included and everything was already adjusted for the standard arrangement. Another PDF is an announcement of a new suspension. It has an illustration which shows that it's the same as the other Oracles. That means it uses the same parts such as springs, dampers, etc. which come in the maintenance kit. But of course it is arranged differently than on the Delphis. The third PDF shows setup for Alexandria Mk3. It shows a suspension gauge and explains how to use it. The illustration doesn't look anything like the gauge which I have, and dimensions aren't shown. If your turntable is satisfactory now, then maybe you can measure the distance and make a gauge from that for use later. It looks like only one dimension is important.

I downloaded two of the instruction manuals for the Delphi. One of them mentions using a cardboard gauge included with the turntable. There is no picture of the gauge and I've never seen it. However, the manuals for both the Alexandria and the Delphi show setup procedures which are useful. I can possibly scan the instructions I have and get them to you somehow, but I think they will be of no use. I think it's best to get the PDF for the Alexandria Mk III and make your own gauge based on your current setup. Perhaps e-mailing Oracle would be worthwhile.

-Terry Chatelain
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Old 6th January 2010, 04:56 AM   #6
Nanook is offline Nanook  Canada
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Default barmycodger, thanks. But I'm Oracle 309....

and posted the Alex Mkll manual over there.
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Last edited by Nanook; 6th January 2010 at 04:56 AM. Reason: typos (again)
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Old 11th January 2010, 09:41 PM   #7
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Quote:
Originally Posted by walrus View Post
I have lost my suspension gauge and know that you can make one out of carboard but need the measurements. If anybody can please post it will be greatly appreciated.

Thanks in advance.
Hi,
Just scanned my original gauge at 300dpi - the ruler scale is in mm.
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File Type: jpg oracle_gauge.jpg (166.6 KB, 225 views)
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Old 13th January 2010, 05:03 AM   #8
Nanook is offline Nanook  Canada
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Default microscript...

...which table? An original Delphi, Premier or Alex , Or?

I measure it in pixels, then measured 20mm on the ruler as a comparison. Drew it in Sketchup as 1px=1mm
then scaled it down to "reality".
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Old 13th January 2010, 10:53 AM   #9
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This gauge was from a Delphi 3, but as far as I know could be used for the original Delphi and Delphi2, as well as the Premier's if you have the proper springs and do not use the counterweight. If you look at the instructions/owner manuals - they are all stored at Vinyl Engine | The Home of the Turntable - setting the suspension with the gauge is only briefly referred in the manual of the Delphi3. The procedure is much better explained in the manual of the Delphi5, showing the gauge and suspension photos.
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Old 13th January 2010, 06:22 PM   #10
AVWERK is offline AVWERK  United States
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Oracle tidbit...
At the CES last week Oracle had a new silicon damped well that sits right next to each spring tower.
You can tune the depth and amount of effectiveness at will.

Don't know if this can be purchased seperately or not.

Regards
David
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