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Old 5th October 2008, 09:23 AM   #631
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Default Lo Fi

A Lo Fi version of the Pearl....

http://cgi.ebay.com/FET-based-MM-Pho...d=p3286.c0.m14

Note the carefully matched Jfets
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Old 5th October 2008, 10:03 PM   #632
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Default Wire for connecting to RCA's

Just wondering what wire to use for connecting the signal input and outputs.

I have 30 gauge Kynar silver plated copper wire, or high quality microphone cable.

Or is there anything better that I could use?
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Old 5th October 2008, 11:51 PM   #633
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Microphone cable might be good. I take it that it's shielded?

Cheers

Jon
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Old 6th October 2008, 07:45 AM   #634
h_a is offline h_a  Europe
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Most important property for a phono cable intended for MM-cartridges is its capacitance.

Remember, MM-cartridges need a certain capacitance (spec'ed by the manufacturer) for 'flat' frequency response. Otherwise you get too much or too little heights (or too much or too little bass, it's all relative).

Total capacitance always includes also the cable, so if your cart needs 300pF and you have 1m of 150pf/m cable, you need a 150pF cap at the input.

Have fun, Hannes
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Old 6th October 2008, 09:15 AM   #635
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Thanks Hannes - I hadn't considered that at all when I answered!!
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Old 6th October 2008, 08:08 PM   #636
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Default Thanks

Thanks for the information.

Another thought has crossed my mind regarding matching of my Cartridge. I have a Benz Micro Ace M, the output being in the order of 800uV, in other words in between LO and HO carts.

What do I need to do to set the correct gain in the Pearl? I will be building the Pearl and the MC Pre stage. I decided to add the MC Pre because I might want to add a LO Cart at some time in the future.

My present Phono stage is about 60dB on paper and it does not seem to overdrive my amp with the Benz so I guess I could try the full gain on the Pearl as a starting point, but would I prefer a more scientific solution.

Unfortunately I am not learned enough to work it out without some guidance
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Old 10th October 2008, 08:12 PM   #637
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Default Capacitance

Hannes,

Thinking about the capacitance then would it be OK to assume if you use the same cable as the interconnects between your TT and Phono stage the capacitance would be OK?
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Old 22nd October 2008, 08:42 PM   #638
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Default Yippeee!!!!

Hi Promitheus,

Thanks for a great kit and superbly packed, arrived this morning

The little "Gummi Baren" are appreciated too

Now I must find a suitable Toroidal or two

And my glasses. Last kit I built the resistors had nice coloured stripes!

Must be a long time now as I could see the writing without glasses
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Old 27th October 2008, 02:23 PM   #639
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Default Pearl Kit

Pearl Kits Post #624
Hi Promitheus,

Just found this thread and am interested in buying two full Pearl kits, can you come back with price /availability?

Richard
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Old 27th October 2008, 04:03 PM   #640
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Hi Richard,
can you send me an email?
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