I'm new to Step Up Transformers


     I've recently become aware of the existence of SUTs (step up transformers). My initial thought was " why do I need an SUT when my phono preamp (Zestos Andros PS-1) has a circuit for Low Output MC cartridges?
     But many people seem to think that an SUT plugged into the MM channel of the phono stage will be a massive upgrade. I'd love to hear the opinions of anyone who has experience with SUTs. Thanks!

128x128rmcfee

@lowtubes : I agree! Different SUT's, like different cartridges, have unique sonic attributes. So experimentation is in order! I have five on hand to try, including a Quicksilver.​​

The Paua is a moving iron cartridge and will work best with a high-gain phono stage - not an SUT.

A Zobel network is often used to damp a transformer. But if you change the source impedance, the Zobel network won't be correct.

If you really want it right so the transformer editorializes least, the only way to really know is the procedure at the link I posted earlier.

Actually the best way is to put your cartridge/transformer on a scope and adjust the zobel to minimise ringing. This I would assume is beyond many here.

I actually used the Zesto/Zobel removed from the phono as a test bed - adjusting the zobel for a 40ohm Denon 103D (New) made very little difference to the sound, virtually inaudible, whereas changing the loading was more audible with that transformer ( Jensen ).

 

The Paua is a moving iron cartridge and will work best with a high-gain phono stage - not an SUT.

This is not true.

Whilst I am not a fan of SUTs, it comes down to the quality of the various options and more importantly whether the high gain phono vs SUT-MM phono can provide the optimum gain and LOAD.

Each of the options has its plusses and minuses.