John Curl's Blowtorch preamplifier - Page 612 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Closed Thread
 
Thread Tools Search this Thread
Old 4th June 2008, 03:59 PM   #6111
diyAudio Member
 
Steve Eddy's Avatar
 
Join Date: Sep 2002
Location: Sacramento, CA
Quote:
Originally posted by john curl
But, how quiet is it? NOISE is EVERYTHING with MC input.
Is it?

Is there no point below which it ultimately becomes meaningless?

If, at the listening position, and with no music playing, you cannot hear the noise being produced by the MC preamp, is the level of noise meaningful beyond a figure on a spec sheet?

se
 
Old 4th June 2008, 04:00 PM   #6112
diyAudio Member
 
Steve Eddy's Avatar
 
Join Date: Sep 2002
Location: Sacramento, CA
Quote:
Originally posted by john curl
Isn't anyone going to ask a useful question?
See above.

se
 
Old 4th June 2008, 04:02 PM   #6113
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Please, a USEFUL question. Not a non-technical rant.
 
Old 4th June 2008, 04:18 PM   #6114
diyAudio Member
 
Steve Eddy's Avatar
 
Join Date: Sep 2002
Location: Sacramento, CA
Quote:
Originally posted by john curl
Please, a USEFUL question. Not a non-technical rant.
Oh. So these discussions have absolutely nothing to do with actually listening to reproduced music? It's really just a game of purely technical one-upmanship?

I rather suspected that it was. Thanks for removing any doubts I may have had.

se
 
Old 4th June 2008, 04:19 PM   #6115
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Out of nothing else to do, let us take apart SE's question. How quiet is good enough? What is good enough for me, an old man? What about a young woman? What about a really low output MC cartridge like the original Ortofon cartridges, that this design was originally made for?
Why do you think that I chose 2 ohms as the input? That is the DCR of the Ortofon cartridge. Yes, it is the cartridge itself that sets the gain. What is the noise figure of this preamp with an Ortofon cartridge? Is it 3dB, 6dB, 10dB? Something else? Hint: With a 10 ohm cartridge, it is 3dB.
 
Old 4th June 2008, 04:21 PM   #6116
diyAudio Moderator Emeritus
 
lumanauw's Avatar
 
Join Date: Oct 2002
Location: Bandung
Send a message via Yahoo to lumanauw
Quote:
Please, a USEFUL question. Not a non-technical rant.
Mr. Curl, how to measure/see noise with ordinary DIY equipment (scope, signal generator, spectrum-soundcard)?
 
Old 4th June 2008, 04:23 PM   #6117
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
I'm sorry, your question is too complicated to answer properly.
 
Old 4th June 2008, 04:23 PM   #6118
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Please tell me when something interesting is to be discussed and solved again, I have no time for useless chat.
 
Old 4th June 2008, 04:25 PM   #6119
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
PMA, you should try the full differential version without caps, running about 2.5ma on each side.
 
Old 4th June 2008, 04:31 PM   #6120
diyAudio Moderator Emeritus
 
lumanauw's Avatar
 
Join Date: Oct 2002
Location: Bandung
Send a message via Yahoo to lumanauw
Capacitor // to R load accross the MC cartridge, is this affecting noise property?
 

Closed Thread


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 01:39 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2