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MM Input Capacitance |
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Ash Malek
New Member Joined: 18 Feb 2018 Status: Offline Points: 24 |
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Posted: 10 Feb 2021 at 8:42am |
Hello everyone. I have no background in electronics whatsoever so this could be a really silly question.
I have a low output MC cartridge (Denon DL-304) feeding GS Elevator EXP, which in turn feeds the input of my MM phono preamp. My question is what MM input capacitance should I set on my MM phono preamp if at all required? Available options are (pf) 188, 141, 94, 47 or no input capacitance. Also, the cartridge loading recommended is >100 ohm. So what do I set on the EXP? 840, 1000, 5100, or 47000? Thanks in advance.
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Chris Firth
Moderator Group Joined: 16 May 2013 Location: Rossendale, UK Status: Offline Points: 1529 |
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The capacitance doesn't really matter.
Load it at 100 ohms. Edited by Chris Firth - 10 Feb 2021 at 9:00am |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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Second question first. >100 could be taken to mean 101, and if so, then 100 is the closest (within 1% tolerance).
Like all properly designed small-signal amplifiers, the EXP has a degree of capacitive load output isolation. It's called a resistor, and its value is 300 ohms which appears in series with its output. None of the options will have any effect on the audible spectrum. However, choosing a capacitive option (rather than none) might help reject RF interference borne on the interconnect between the units. |
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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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Ash Malek
New Member Joined: 18 Feb 2018 Status: Offline Points: 24 |
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Thank you for your answers gents.
Bonus question. What happens to the cartridge if I select a higher load? I notice an apparent higher volume at 840 ohms and no further change at higher settings (1000 ohm and above). Am I harming the cartridge by doing so? (Probably require a long answer so just reply with a link and I’ll do the rest.) Thanks.
Edited by Ash Malek - 10 Feb 2021 at 9:50am |
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Ash Malek
New Member Joined: 18 Feb 2018 Status: Offline Points: 24 |
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https://youtu.be/8Hq1G4WID-U
Found this on YouTube to answer my own bonus question. It’s now clear as mud.
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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The right load is like your car driving on a flat road. If the load is too heavy (smaller number) then it's like climbing a hill. If a higher number its like going downhill. It get's faster but eventually it can't get up anymore speed. Even if you drove off a cliff it couldn't exceed 32ft/sec/sec. Should I stop there?
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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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Ash Malek
New Member Joined: 18 Feb 2018 Status: Offline Points: 24 |
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Thank you sir
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