John Curl's Blowtorch preamplifier part II - Page 3646 - diyAudio
Go Back   Home > Forums > Member Areas > The Lounge

The Lounge A place to talk about almost anything but politics and religion.

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
Reply
 
Thread Tools Search this Thread
Old 8th March 2013, 12:43 AM   #36451
bcarso is offline bcarso  United States
diyAudio Member
 
Join Date: May 2005
Location: Canoga Park, California
Quote:
Originally Posted by 1audio View Post
There is a trick. Lundahl has it on their site. it allows the transformer to be much smaller. http://www.lundahl.se/pdf/7101.pdf However it doesn't work for this application (I asked).

The AP output transformer trick works but does require virtually perfect matching of the DCR of the transformer, hence the extra winding. I also asked about this and the Jensen guys did not recommend it, too difficult to execute and expensive. They make the transformer for AP.
Thanks Demian. Yes, after I thought a while I remembered the article somewhere about mic transformers, was it by Gaylord?

I understand that the latest Ap analyzers use a synthetic active transformer, which is o.k. in some cases but of course does not have galvanic isolation.

UREI used to license the patent for the copper resistor and used those transformers in some of their equipment.
  Reply With Quote
Old 8th March 2013, 08:11 AM   #36452
diyAudio Member
 
Join Date: Aug 2009
Quote:
Originally Posted by john curl View Post
IF I wanted to conform with market trends, I would design tube equipment.
Why follow building tube equipment market trends - spoken opposite, can we not see it with solid state as well?

Another point is that you only state with masurements. OK, they are fundamental but I'd like to see some objective statements regarding how it sounds. Why you don't compare both prototypes of the phono stage versions (with / without input transformers) and compare them in practical sonical tests. Would be informativ what the sonics results are. Maybe the version with input transformers sounds better?
  Reply With Quote
Old 8th March 2013, 08:36 AM   #36453
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
You mean a controlled listening test with experienced listeners?
I believe John is against that.

jan
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 8th March 2013, 09:15 AM   #36454
Bonsai is online now Bonsai  Taiwan
diyAudio Member
 
Bonsai's Avatar
 
Join Date: Jul 2003
Location: Taipei, Taiwan
Objective statements about how something sounds is an oxymoron.
__________________
bonsai
Amplifier Design and Construction for MUSIC! http://hifisonix.com/
  Reply With Quote
Old 8th March 2013, 09:30 AM   #36455
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Quote:
Originally Posted by Bonsai View Post
Objective statements about how something sounds is an oxymoron.
Depends. If one uses a panel of listeners and collects rankings along various "subjective" quality axes (e.g., "brightness," "clarity," "image specificity," that sort of thing), objective conclusions can be drawn about subjective impressions. These data are often presented in "radar charts." ANOVA is your friend here.

That's not very practical for low volume items made for niche markets, unfortunately.
__________________
The more you pay for it, the less inclined you are to doubt it.- George Smiley
  Reply With Quote
Old 8th March 2013, 11:39 AM   #36456
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Quote:
Originally Posted by Bonsai View Post
Objective statements about how something sounds is an oxymoron.
Not at all. It is very well possible to get objective judgements about subjective perceptions.
Actually, it can be argued that the only judgements about 'how something sounds' that have any value beyond just the single, personal, anecdotal judgement is an objective judgement.

jan
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!

Last edited by jan.didden; 8th March 2013 at 11:42 AM.
  Reply With Quote
Old 8th March 2013, 01:09 PM   #36457
diyAudio Member
 
vacuphile's Avatar
 
Join Date: Apr 2011
Location: Seaside
Hurray, semantics.
  Reply With Quote
Old 8th March 2013, 02:01 PM   #36458
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: cambridge ma
Quote:
Originally Posted by jneutron View Post
Reminds me of the ultraviolet catastrophe.

jn
Next gen masks will need a CO2 laser to create UV with a tin plasma, the estimate was 250KW in and 450mm wafers at $10Mil for a mask set.
__________________
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed all-important."
  Reply With Quote
Old 8th March 2013, 02:01 PM   #36459
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Quote:
Originally Posted by vacuphile View Post
Hurray
Me personal opinion is that punctuation and grammar should be in accordance with semantics, first.

Argued and arguemented can have two slightly off-set meanings.
It's only by having shared a pint, which enables me to re-arrange Jan's written text inside my feeble head, to make the meaning match up with his personality "blueprint".

Lingo can be a Dingo, mate.
__________________
The buck stops Here
  Reply With Quote
Old 8th March 2013, 02:07 PM   #36460
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: cambridge ma
Quote:
Originally Posted by bcarso View Post
I've not seen that, although it is an intriguing notion.
http://www.picovolt.com/win/elec/art...-xfmrs_RSI.pdf

EDIT - That's DR. Hill's site (of the book fame). He does not seem to have added much for several years.
__________________
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed all-important."

Last edited by scott wurcer; 8th March 2013 at 02:19 PM.
  Reply With Quote

Reply


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 08:39 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