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Shure SUT 1:10 is it possible to use for MC cartridge?

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Shure SUT 1:10 is it possible to use for MC cartridge?

Postby vanakaru » 20 Nov 2017 13:21

I have SUT's from a microphone mixer. These inputs are 2Ohm and outs 2kOhm. Could these be used for MC cartridge and how?
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Re: Shure SUT 1:10 is it possible to use for MC cartridge?

Postby jdjohn » 20 Nov 2017 16:17

Yes, but probably only using the 2-ohm input, realistically, with an MC cart that has VERY low DC resistance. Unfortunately, those types are usually the most expensive. Anyway, you would then feed the output of the SUT into a regular MM phono input.
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Re: Shure SUT 1:10 is it possible to use for MC cartridge?

Postby vanakaru » 20 Nov 2017 18:10

I see, so Denon DL103 line with 0,3mV would work or it should be lower still?
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Re: Shure SUT 1:10 is it possible to use for MC cartridge?

Postby jdjohn » 20 Nov 2017 21:41

The SUT at 1:10 would boost the DL-103 signal enough (from 0.3mV to 3.0mV), but the impedance matching is not the best. The standard DL-103 has an impedance of 40-ohms, but that SUT only has choices of 2 and 2,000. There are some variants of the DL-103 with lower output impedances in the 13-14 ohm range which would work better, but still not ideal.

Many of the Ortofon MC carts have really low impedance like in the 2-5 ohm range, which would be good. A few Audio Technica as well, Dynavector, Koetsu, and others.

If you already have a DL-103, it certainly won't hurt to try it...nothing will blow-up or get fried. You could try both the 2ohm and 2Kohm settings and see how it sounds.
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Re: Shure SUT 1:10 is it possible to use for MC cartridge?

Postby DeepEnd » 21 Nov 2017 08:44

May be a silly question but is the 2 Ohms specified as the DC resistance of the primary? If so the impedance at audio frequency will be significantly higher.

From memory most mixing desks try to present a 600 Ohm impedance for microphones. The transformer in these tend to have a primary resistance of about 20 Ohms and secondaries between 2k and 3k so the 2 Ohms looks very very low. Might be worth measuring to double check.

Normally the input impedance of an audio transformer is determined by the load on the secondary (normally 47k, 68k or 100k depending on the phono stage) divided by the square of the ratio (100 for a 1:10) which would give you input impedances of 470 Ohms, 680 Ohms or 1k Ohms. You may also need to add a cap/ resistor combination on the secondary output to avoid overshoot.

Have a look at this page to give you more background info:-

http://www.rothwellaudioproducts.co.uk/ ... xplai.html
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