Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 11th April 2013, 09:33 PM   #1711
stajo is online now stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
Quote:
Originally Posted by Salas View Post
Seems like computing, right?
But I look super unlinear. 2 clicks to -15 and 2,5 to -25 C-G.
  Reply With Quote
Old 11th April 2013, 09:45 PM   #1712
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
FFT it and if high THD move your point regarding the DCR of your choke by adding some resistor to it. Can't be really CCS horizontal with a practical choke, it should go elliptical at a point and those charts are GE vintage so don't try nail it by just eyballing, better measure. Your PicoScope does 16bit FFT. Use expected amp output load.
  Reply With Quote
Old 11th April 2013, 09:52 PM   #1713
stajo is online now stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
I will eyeball it tomorrow. Get linear or die is the word from Salas.

Well. I think it sounds good. Its punchy and bright without flaring out. Eyeballing will fix that np.

Lower the the choke DCR and maybe voltage and would be interesting
  Reply With Quote
Old 11th April 2013, 09:56 PM   #1714
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Only watch twice when you measure and take your time to evaluate the gear settings. I trust its much lower THD already than what you may fear.
  Reply With Quote
Old 11th April 2013, 10:07 PM   #1715
stajo is online now stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
Dou you work with ARTA?
  Reply With Quote
Old 11th April 2013, 10:12 PM   #1716
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Yes among others for 24bit audio card FFT. Lately mostly with ARTA bcs its balanced in goodness across several things. And I don't forget useful details by changing the GUI clues across programs all the time. Your Pico should be very indicative with 16bit also. Its not an AD797 super chip to test.
  Reply With Quote
Old 11th April 2013, 10:14 PM   #1717
stajo is online now stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
How do I measure THD with Pico?
  Reply With Quote
Old 11th April 2013, 10:19 PM   #1718
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Its spec mentioned FFT. Read the manual to see if that is correct. It should have something in its software bundle for that. Or some sub menu on what interface you use now.
  Reply With Quote
Old 11th April 2013, 10:35 PM   #1719
stajo is online now stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
Manual. You meen those things they made in the 80s? Blogs and disordered FAQs maybe.
  Reply With Quote
Old 11th April 2013, 10:49 PM   #1720
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
They give a PDF in a CD or they got one to download usually.
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help me design my DAC/Line Preamp. kuroguy Tubes / Valves 7 2nd April 2009 08:31 PM
preamp line ctt richwalters Tubes / Valves 1 7th March 2008 04:34 PM
Preamp for Line In and Mic blur Instruments and Amps 1 4th January 2007 04:02 PM
Line stage preamp, based on SY's "Heretical Unity gain line stage" Danko Tubes / Valves 23 18th July 2005 04:07 AM
Line preamp for 2A3 amp Petman Tubes / Valves 0 24th May 2002 03:11 PM


New To Site? Need Help?

All times are GMT. The time now is 06:53 PM.


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