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capacitance loading logic |
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Teesside Tom
Senior Member Joined: 27 Aug 2021 Status: Offline Points: 115 |
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Posted: 13 Oct 2021 at 9:43am |
Good Morning, last week I took delivery of an Accession M phono stage and Enigma ps on home demo. Under the heading Cap Load the Accession booklet states the cartridge sees the capacitance of the tonearm wiring and arm cable plus whatever is set on the phono stage via the dip switches, the capacitance value of the arm wiring and interconnect should be subtracted from the cartridge capacitance which will leave a value to be set on the dip switches for best matching.
Yesterday I received an email from my turntable / tonearm manufacturer stating that the combined capacitance value of the tonearm wiring and cable, which are both Litz silver cores is 320pF. The cartridge is an Audio Note IQ3 mm, recommended load capacitance 150 - 200pF. This would leave a negative value and so to my logic the dip switches should all be set to zero or out? This is the nearest match I can hope for unless I change the cartridge or wiring, is my logic correct? I took delivery of the turntable in late March, ordered last December, when ordering I already owned and was using the cartridge and I cannot help but feel the dealer has done me something of a disservice by not flagging up that by specifying the top option of the Litz wiring/ cabling I was creating a mis match from the point of capacitance matching. This is my first experience of a stand alone adjustable phono stage previous units have been integrated in the pre amp (which Iv'e had for at least 15 years) it 's a bit of a learning curve in more than one way.
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Teesside Tom
Senior Member Joined: 27 Aug 2021 Status: Offline Points: 115 |
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My apologies for posting in my haste under the topic of Music, it should have been under Graham Slee phono stages.
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patientot
Senior Member Joined: 28 Nov 2018 Location: USA Status: Offline Points: 1525 |
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Zero is probably the best option you can hope for here under the circumstances. Unfortunately many tonearm manufacturers automatically assume the end user is going to use a moving coil cartridge (not really affected by capacitance) so they will use higher capacitance wiring in the tonearm and not tell you. Bear in mind that as we age we lose our high frequency hearing ability so you may not notice that much difference in a 320pf load vs. a 200pf total load on this cartridge. It just depends on those factors, which are going to be different for the individual. When you set the Accession switches to 0pf, how does it sound to you on records you are familiar with?
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SL-1200 MK7 (modified) + Reflex M + PSU-1 used with AT150-40ML, AT VM95ML, Stanton 680mkII + Ogura, and Shure M35X cartridges.
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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Now, what kind of wazzock who understands how these things work, would do a trick like that? Answer: a wazzock who doesn't understand how it works. Hopefully it's not one of my dealers. Here's what a Technics SL1200 II arm and cable measures (excuse the dust). (PS. It's OK by me to post in the wrong place ) |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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lfc jon
Senior Member Joined: 23 Jan 2018 Location: Devon Status: Offline Points: 3986 |
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I know some people don't like RS, But when I got back into Vinyl one of the first things they asked me was did my amp have a phono amp built in and whether it was MM or MC as I had a set budget. They said to me you would be surprised how many people come back and complain that their turntable didn't work with their amp and had not put money a side for a phono amp, so being that it sounds like you were spending a lot of money on your turntable I would have thought they would have asked some questions or given you some idea of what you were getting your self into.
But at lest your on the right forum to get good answers from vary good people
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Reflex M, Solo (both with PSU-1) CuSat50, Lautus, Spatia & Spatia links cables. Ortofon Bronze.
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ICL1P
Senior Member Joined: 04 Aug 2012 Location: Faringdon, Oxon Status: Offline Points: 2341 |
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I’m guessing the arm is an Audio Note Arm Three. https://www.audionote.co.uk/arm-three
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Ifor
===== Reflex M & ACCESSION M, CuSat50, Majestic DAC, a Proprius pair. |
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Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8998 |
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A little disappointing with the cartridge and arm from same manufacturer but it may sound better than the specs suggest. And your Accession can help to counter any brightness as the US setting cuts over 2dB at 10 kHz compared to standard RIAA.
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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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