External step-up transformer with Io or MP-1

It is an interesting idea and one I have recently done with an Io Signature and an ARC MCP-33. I just completed an update to the ARC. The Io, set to low gain, was used to verify the ARC component functioned correctly after the rework.

I can not report how a SU transformer might work here as the ARC is a tubed device. The ARC has an adjustable gain of 16, 20 and 24 db. Compared to the standalone Io set at 68db gain, the Io/MCP-33 combination gave up a little bit of bass; there was some added noise and hum most likely due to the mess of cabling ..... but ..... there was a little more treble energy and perceived extension which is no surprise as this is often typical of ARC products, new and old. And the Io is a little soft on top. Portrayal of space, decays and placement of musicians was first rate with either configuration.

Overall, the Io/MCP-33 combination is very musical but not a typical use of either product. And again, this was only done for the sake of validating the functionality of the MCP-33. The added cost with a Jade Hybrid IC and a Stealth Dream or Dream State PC for the MCP-33 makes this an expensive setup .... a very pleasing result ..... but ultimately bettered by the Io on its own.

John

I asked Ralph Karsten (of Atma-Sphere) the same question at CES, in reference to a Shelter 901. He said it is not necessary, as the MP-1 has enough gain. I listened to the 901 into the MP-1 all year, and it sounded fine, NO noise at all.

That said, two friends recently acquired Bent Silver Step-Ups, so I will borrow one to use between the 901 and the MP-1, and compare the results.

I realize that the Io, MP-1, and many, many other phonostages have enough gain to work with low-output MC cartridges.
I'm not concerned with what is technically possible or with what should sound better in theory; I'd like to know what people have found to sound best in practice. The Manley Steelhead, for instance, can amplify low-output MC cartridges through its MC input but many users prefer to use an SUT and the MM input of the Steelhead.

I'd like to know what people have found to sound best in practice.

Unfortunately, there is no general rule. Some Cartridges sound well without SUT AND are also good sounding when you connect it to such a unit.
And some wake up with it, some not and there is everything in between.
The main problem - IMHO - is to find a good SUT, most are colouring and degrading the Signal. The only one I can bear is the Kondo SFz.
Sometimes it's Magic.
Not always, but sometimes.

Sometimes it's Magic

What you're saying is that in rare instances, when perfectly matched with a particular cartridge, an SUT offers more benefits than just the reduction of noise.
This is what intrigues me.
Have you heard any of the offerings from Auditorium 23?