New Posts New Posts RSS Feed - MM Input Capacitance
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Welcome to the Graham Slee Audio Products Owners Forum

 

Open to all owners plus those contemplating the purchase of a Graham Slee HiFi System Components audio product and wishing to use this forum's loaner program: join here (Rules on posting can be found here)

This website along with trade marks Graham Slee and HiFi System Components are owned by Cadman Enterprises Ltd


MM Input Capacitance

 Post Reply Post Reply
Author
Ash Malek View Drop Down
New Member
New Member


Joined: 18 Feb 2018
Status: Offline
Points: 24
Post Options Post Options   Thanks (1) Thanks(1)   Quote Ash Malek Quote  Post ReplyReply Direct Link To This Post Topic: MM Input Capacitance
    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.
Back to Top
Chris Firth View Drop Down
Moderator Group
Moderator Group


Joined: 16 May 2013
Location: Rossendale, UK
Status: Offline
Points: 1529
Post Options Post Options   Thanks (1) Thanks(1)   Quote Chris Firth Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 2021 at 8:56am
The capacitance doesn't really matter.
Load it at 100 ohms.


Edited by Chris Firth - 10 Feb 2021 at 9:00am
Back to Top
Graham Slee View Drop Down
Admin Group
Admin Group
Avatar
Retired

Joined: 11 Jan 2008
Location: South Yorkshire
Status: Offline
Points: 16298
Post Options Post Options   Thanks (1) Thanks(1)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 2021 at 9:11am
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.
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
Back to Top
Ash Malek View Drop Down
New Member
New Member


Joined: 18 Feb 2018
Status: Offline
Points: 24
Post Options Post Options   Thanks (1) Thanks(1)   Quote Ash Malek Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 2021 at 9:18am
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
Back to Top
Ash Malek View Drop Down
New Member
New Member


Joined: 18 Feb 2018
Status: Offline
Points: 24
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Malek Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 2021 at 10:13am
 https://youtu.be/8Hq1G4WID-U

Found this on YouTube to answer my own bonus question. It’s now clear as mud.
Back to Top
Graham Slee View Drop Down
Admin Group
Admin Group
Avatar
Retired

Joined: 11 Jan 2008
Location: South Yorkshire
Status: Offline
Points: 16298
Post Options Post Options   Thanks (1) Thanks(1)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 2021 at 10:26am
Originally posted by Ash Malek Ash Malek wrote:

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.


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? Wink
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
Back to Top
Ash Malek View Drop Down
New Member
New Member


Joined: 18 Feb 2018
Status: Offline
Points: 24
Post Options Post Options   Thanks (1) Thanks(1)   Quote Ash Malek Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 2021 at 10:32am
Thank you sir Thumbs UpEmbarrassed
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.141 seconds.