SUT Question...

[Weeman1973]

I'm very new to the world of MC cartridges so please bear with me here.

I'm currently using a Goldring Eroica L MC cartridge with an output 0.25mV running into my Dynavector 100P Phono Stage which has 63db of gain & 100 ohm loading.

As the output is still very quiet, I've bough a used 1:15 SUT (Klaus Hurler with BD transformers) which is really for a Denon 103r but thought I'd give it a whirl but I haven't noticed any volume output difference at all (in fact if anything it appears quieter than when using the DV MC stage on it's own).

Have I done something wrong here is it just the SUT I've got isn't compatible with my cartridge or Phono Stage?

Thanks.

[Boyse6748]

There are others with more knowledge than I, so wait for others to respond before doing anything drastic.

I think a ratio of 1:15 (Medium) is a bit on the low side for your particular cartridge and a Ratio of 1:20 may be more suitable.

Mind you, I’m not a SUT expert, so take this advice with a pinch of salt and wait for more expert advice from others.


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[Firebottle]

What is the spec of your MM Input?
If it is the typical 40dB gain then using a 15:1 SUT puts you at virtually the same gain levels as going direct to your MC input.

[Weeman1973]

What is the spec of your MM Input?
If it is the typical 40dB gain then using a 15:1 SUT puts you at virtually the same gain levels as going direct to your MC input.

Not sure of the gain on the MM input on the P100 but I recall reading about 63db?

As you mention though, the current 1:15 SUT I'm using through the MM is probably slightly less in volume in going straight into my MC input so no advantage at all.

[chris@panteg]

Try a 1-20 ratio, my puresound T10 is 1-18 or 1-36 and the 1-18 gives higher output I believe because it matches my AT33EV better.

[Barry]

You really need a 1:20 turns ratio SUT. This will boost the 0.25mV output of the cartridge to 5mV, and at the same time will present an impedance to the cartridge of ~120 Ohm.

[Jazid]

Does your phono stage have a phono enhancer in it, and if so is it switched on by any chance? That might be a cause? Worth playing with anyway..

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[Weeman1973]

Thanks for everyone’s replies.

I’ve now bought a Denon 103r which I’m running with the 1:15 SUT through the MM input on my Nova Fidelity X40 & very happy!