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Do SUTs work well with the Accession MM

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PhilH View Drop Down
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    Posted: 28 Mar 2022 at 3:50am
Hi,

Saw a post in review by Michael Fremer on the Accession MM that the Bob’s Devices SUTs work really well with the Accession MM. Has anyone had experience in this area?


Edited by PhilH - 28 Mar 2022 at 2:03pm
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tachi View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tachi Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 2022 at 1:29pm
I'm using a Rothwell MCX (1:10) SUT with Accession M, cartridge is Audio Technica Art-9XI. So far, very happy with the gain, normally I set at 10 o'clock for my listening via Stax headphones.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Help with bass Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 2022 at 10:15pm
I acquired a Denon AU-250 step-up transformer and connected it to my Accession MM and my arm cable to the AU-250 and powered everything up and nothing bad happened. 
I don't have a suitable cartridge to test this set-up further however. I think there might be a great orthodoxy of cartridge matching thought locked up in a false SUT vs. Active Head Amp dichotomy, but i'm not sure. i can attest only that it's safe to a limited extent to connect a step up transformer to Accession MM.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 2022 at 11:24pm
You are right there is an orthodoxy or rather calculations for stepping up the MC voltage to MM levels (turns/gain ratio) whilst matching the impedance (turns ratio squared) so it depends on the cartridge and SUT. Without knowing your cartridge I can't tell if will work well or sound boring/safe. Sorry to be pedantic but choosing between an SUT and a head amp is a dichotomy as it is two distinct options.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 30 Jun 2022 at 6:02pm
I couldn't find the spec for the AU-250 but lets imagine its gain is 10x. If so the cartridge would see 470 ohms loading, 47k / 100. If that was too high a 12k resistor could be added in parallel to the preamp input to give the cartridge 100 ohms loading.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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