Nearly New, good savings
Rothwell SUT, MC1, 220 Euros, or $262. usd plus shipping from Ireland (ask for price). New: $280 euro, $333. usd. Seller says a few months old.
https://www.adverts.ie/home-audio/rothwell-mc1-sut/23521441http://www.rothwellaudioproducts.co.uk/html/moving_coil_step-up_transforme.htmlI just happen to be looking for a SUT for my friend’s MC cartridge.
By design, this SUT 12.9 x-factor shows 100 ohms loaded impedance to the MC Cartridge. For many cartridges, fixed 100 ohm load can be an advantage. (typical 12.9 x-factor shows 283 ohms to the cartridge).
Rothwell says for cartridges with .3 to .7 mv signal strength; for coil impedance less than 20 ohms. 100 ohms is the ’ 10x formula’ of a coil with 10 ohms.
i.e. my friend’s Goldring Eroica LX .5mv signal, 8 ohm coil resistance. Goldring recommends 100 ohm loading. .5mv x 12.9 x-factor = 6.45 mV signal to MM input (allow for a small amount of signal strength loss).
i.e. my AT33ptg/II .3mv, 10 ohm coil impedance. only 3.87 mV signal; formula’s 100 ohm load. A bit low signal strength for me, I use my SUT’s 20.68 x-factor: 6.02 mV which shows 110 ohms to my 10 ohm cartridge.
Note: no MM Bypass; single input, it’s a specific solution which keeps the cost down.
This Entre ET-100 has 3 inputs, MM Pass, and 3 optional settings
https://www.ebay.com/itm/203344578296?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=533...I chose this one, Fidelity Research FRT-4: 3 inputs, MM Bypass; 4 optional settings
https://www.ebay.com/itm/124558472024?hash=item1d00437358:g:QO4AAOSw5RVgmR1y