Lowering cost of audio output transformer - Page 2 - 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 27th August 2012, 06:13 PM   #11
pilovis is offline pilovis  Italy
diyAudio Member
 
Join Date: Jan 2012
Location: Nizza Monferrato - Italy
Quote:
Originally Posted by jean-paul View Post
Thread title:

Lowering cost of SE audio output transformer

Suggested thread title:

Making good SE output transformers at lower cost

Reason: price should not be the only driving factor. Quality is prevalent in audio DIYing since the device will be more expensive than ready built devices anyway.
I pay these custom transformers only 15 Euro each (40VA), it worth a try
  Reply With Quote
Old 27th August 2012, 06:16 PM   #12
pilovis is offline pilovis  Italy
diyAudio Member
 
Join Date: Jan 2012
Location: Nizza Monferrato - Italy
Quote:
Originally Posted by leadbelly View Post
I actually still don't understand what you are you doing. Are you just ordering a special version of a standard model transformer from a manufacturer, i.e. you instructed them to build you one of their standard power transformer models except to create a gap using paper? Or do you have a transformer in hand that you took down to the laminations without destroying the bobbins and are reassembling it with a gap?
yes, I am ordering a special version of a standard model transformer from a manufacturer and instructed them to build one of their standard power transformer models except to create a gap using paper and wound them according to the winding sequence described above.
  Reply With Quote
Old 27th August 2012, 07:37 PM   #13
Cassiel is offline Cassiel  Libya
diyAudio Member
 
Cassiel's Avatar
 
Join Date: Sep 2004
Location: Madrid
And they charge you only 15 euros for a custom job? Wow, that's cheap. What's the price of their power transformer? It can't be cheaper. Something doesn't add up here.
__________________
Making friends

Last edited by Cassiel; 27th August 2012 at 07:41 PM.
  Reply With Quote
Old 27th August 2012, 07:50 PM   #14
pilovis is offline pilovis  Italy
diyAudio Member
 
Join Date: Jan 2012
Location: Nizza Monferrato - Italy
Quote:
Originally Posted by Cassiel View Post
And they charge you only 15 euros for a custom job? Wow, that's cheap. What's the price of their power transformer? It can't be cheaper. Something doesn't add up here.
They sell a standard 40 VA transformer for 15 Euro plus VAT, for the same price the built me the prototypes.

I also asked them to built me a custom line trasformer (winding shielded) of 150 VA: pri. 220V / sec. 125-0-125 0.5 A, 6.3V 3A, 19V 1 A, I paid it 40 Euro plus VAT.

Their website: http://www.pattrasformatori.com

Last edited by pilovis; 27th August 2012 at 08:02 PM.
  Reply With Quote
Old 27th August 2012, 09:48 PM   #15
ilimzn is offline ilimzn  Croatia
diyAudio Member
 
Join Date: Feb 2005
Location: Zagreb
Hopefully you are aware that a gapped core suitable for a 40VA transformer will be able to pass only a fraction of that power at audio frequencies... and if it's wound for voltage transformation derived from a mains transformer calculation, they will also have way too low inductance of the primary to even work at mains frequency, let alone lower. This ill improve with lowering the gap width but then maximum DC current will fall too...
  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
Below-Cost Sale: Japanese Z11 Core SE Output Transformer Pair with Thick Alu. Covers DIY Hifi Supply DIY HiFi Supply 6 7th February 2012 07:12 AM
Lowering voltage output of transformer TGRANT Tubes / Valves 8 17th January 2007 10:29 AM
Lowering the output impedence of this dac's output georgehifi Digital Source 14 31st October 2006 07:05 PM
Lowering clock output audiokid25 Digital Source 4 6th June 2005 07:08 PM
Lowering HV secondary on Power Transformer edsmith Tubes / Valves 4 11th February 2005 07:38 AM


New To Site? Need Help?

All times are GMT. The time now is 10:13 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