#26 pre amp - Page 250 - diyAudio
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 7th February 2013, 10:41 AM   #2491
euro21 is offline euro21  Hungary
diyAudio Member
 
Join Date: Sep 2004
Location: Budapest
Quote:
Originally Posted by palmas View Post

did you measure inductance with 100mA?
Why not? :-)
Attached Images
File Type: jpg OTP inductance real measurement.jpg (63.2 KB, 590 views)
  Reply With Quote
Old 7th February 2013, 12:36 PM   #2492
massimo is offline massimo  Italy
diyAudio Member
 
Join Date: Dec 2002
Location: Milan, Italy
Quote:
Originally Posted by merlin el mago View Post
I always read all people said to connect the ground to 1st cap psu
No Felipe, Wavebourn is absolutely correct. If you use R or L, the new ground point becomes the lastest Cap minus pin
  Reply With Quote
Old 7th February 2013, 12:39 PM   #2493
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
I was confused, thanks Massimo, how about the power tx: use isolated two tx 230:125/125:230VAC or two in series for 250VAC?

Last edited by merlin el mago; 7th February 2013 at 12:59 PM.
  Reply With Quote
Old 7th February 2013, 03:57 PM   #2494
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by merlin el mago View Post
I always read all people said to connect the ground to 1st cap psu
Now you know better than "All people that said"
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 7th February 2013, 05:42 PM   #2495
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Hey guys, coming back to my psu, what do you think is better:

-Isolated tx 230VAC
-Series tx 250VAC

Thanks for comments.
  Reply With Quote
Old 7th February 2013, 05:43 PM   #2496
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by Wavebourn View Post
Now you know better than "All people that said"
I like to learn
  Reply With Quote
Old 8th February 2013, 12:59 PM   #2497
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
More or less the ripple is the same 11-12mV so it seems to have more advantatge using two configurated as one isolation tx, attached psud2 pics, what do you think?
Attached Images
File Type: png #26 psu two 125VAC isolated.png (164.8 KB, 534 views)
File Type: png #26 psu two 125VAC series.png (165.7 KB, 476 views)
  Reply With Quote
Old 10th February 2013, 12:01 PM   #2498
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Using two txs as isolation wich gnd have I to connect to mains: the 2nd tx of the 1st tx & left the 1st floating?
  Reply With Quote
Old 11th February 2013, 05:25 PM   #2499
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Have I to connect the mains tx ground as per schematic?
Attached Images
File Type: gif felicia power line isolated transformer.gif (16.4 KB, 377 views)
  Reply With Quote
Old 18th February 2013, 03:26 PM   #2500
diyAudio Member
 
Join Date: Aug 2005
Default FINISHED!

Last photos of my implementation: The Supply Chassis!

Final result: Incredible clear #D presentation, dead quite with virtual zero noise on the speakers (even with your ear deep inside the mid/woofers).

I am very happy, the final result is really impressive.
Thanks to all (Thomas, Ale, Kevin and Rod) for your strong help and support.
Attached Images
File Type: jpg IMG-20130216-00538.jpg (187.1 KB, 315 views)
File Type: jpg IMG-20130216-00537.jpg (196.7 KB, 189 views)
File Type: jpg IMG-20130216-00535.jpg (189.4 KB, 185 views)
File Type: jpg foto4.jpg (491.8 KB, 202 views)
File Type: jpg foto1.jpg (482.3 KB, 199 views)
  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 10:57 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