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Old 26th February 2013, 10:48 AM   #8401
Joachim Gerhard is offline Joachim Gerhard  Germany
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I think for MM we have to reduce the idle, from the standpoint of current noise and also because of the input impedance.
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Old 27th February 2013, 05:22 PM   #8402
MiiB is offline MiiB  Denmark
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I have the RiAA Values for a 42-44 dB gain circuit. idle reduction can be done by alteration in in central CCS. What kind of current would you want through the input transistors..??

Personally I dont think anr current reduction is needed as the driving signal is so much stronger, the noise suppression will still be enoumous, but off course the input impedance will be an issue.

Last edited by MiiB; 27th February 2013 at 05:24 PM.
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Old 27th February 2013, 06:30 PM   #8403
Joachim Gerhard is offline Joachim Gerhard  Germany
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The " natural " input impedance of the Paradise is around 10kOhm.
That is too low for MM. I would like it to be at least more then 50kOhm.
The problem is that reduced idle will then also reduce the amount of current that we can dump into the RIIA worsening distortion. On the other hand we have lesss gain and that brings the performance back. Kind of juggling. We COULD of cause use Fets at the input with only a small change in topology.

Last edited by Joachim Gerhard; 27th February 2013 at 06:35 PM.
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Old 28th February 2013, 08:49 PM   #8404
Joachim Gerhard is offline Joachim Gerhard  Germany
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This could be usefull for servo :
http://de.mouser.com/pdfdocs/opa2180.pdf
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Old 28th February 2013, 11:37 PM   #8405
Bksabath is offline Bksabath  United Kingdom
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Quote:
Originally Posted by MiiB View Post
I have the RiAA Values for a 42-44 dB gain circuit. idle reduction can be done by alteration in in central CCS. What kind of current would you want through the input transistors..??

Personally I dont think anr current reduction is needed as the driving signal is so much stronger, the noise suppression will still be enoumous, but off course the input impedance will be an issue.
Hey that wuld be just perfect for one of those...
http://www.acton-gate-audio.co.uk/pr...uctName=Sumiko Blue Point Special&ProductID=2903

Was tempted to get one especialy for the 35dB channel separation.
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Old 7th March 2013, 06:44 PM   #8406
Joachim Gerhard is offline Joachim Gerhard  Germany
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good old stuff :
http://www.ax84.com/static/rdh4/chapte17.pdf
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Old 9th March 2013, 01:47 AM   #8407
Joachim Gerhard is offline Joachim Gerhard  Germany
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A new structure that could substitute tubes :
Electron field emitter technology to improve imaging, communications
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Old 9th March 2013, 04:11 AM   #8408
GaryB is offline GaryB  United States
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Default Vacuum transistors

There was recently a seminar where NASA researchers presented an overview of their work on vacuum tubes built on the nanoscale. Very interesting stuff. Slides here: http://sites.ieee.org/sfbanano/files...9_modified.pdf
---Gary
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Old 9th March 2013, 04:19 AM   #8409
Joachim Gerhard is offline Joachim Gerhard  Germany
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I like the term : " Premier Audio"
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