Beginner Q: any ct trafo for Stax adapter? - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 20th February 2008, 01:46 PM   #1
pilli is offline pilli  France
diyAudio Member
 
Join Date: Aug 2006
Default Beginner Q: any ct trafo for Stax adapter?

For the purpose of testing Stax "earspeakers" I would like to put together a transformers-based adapter.
(A basic "works-notworks" test, waiting to build or buy a dedicated amplifier.)


Did I understand correctly, that this adapter is made of center-tapped step-up tranformers, where the center tap is biased, as the diaphragm, to an appropriate voltage (580V for Pro, 230V for the Normal)?


If this is the case, here is my second question(s):

Can this be done with "normal" center-tapped output transformers?
I have two smallish transformers from an old ECL82 amplifier, that have say "3.5" on one side and 5000 Ohm" on the other sidez (this oen being center-tapped).
Can I expect these to withstand the bias voltage?


Could this be done with "100V line transformers" from a 100W PA amplifier?
I have two of these, and it seems like the taps are symmetric (I'll test more accurately) and function as step-ups.
These look "bulky" to me (2Kg weight and thick conductors) but again, would they stand 580V?



Thanks for any help.
I would normally "just try it and see what happens".
But in this case, even if I can keep the bias voltage low, it needs to be high enough to discourage such an approach; not ready to sacrifice those trafos, let alone the Stax-es...


Giuseppe




_
  Reply With Quote
Old 20th February 2008, 04:57 PM   #2
pilli is offline pilli  France
diyAudio Member
 
Join Date: Aug 2006
Default embarrassed



...think I found the answer by myself...

The step-up transformer center tap is connected to the "zero" of the bias high tension, and the membrane at "ht" volts.
(I had a bad scan of a diagram, where the two looked connected, which wouldn't "bias" much...)


I think I now feel like "just trying".




_
  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
Stax CA-X Preamp EchoWars Solid State 34 3rd January 2014 10:30 PM
Power supply options.. bigger trafo with less caps or medium trafo with heavy caps? rhythmdiy Chip Amps 9 23rd October 2007 01:30 AM
Stax DA300 thinkbad Solid State 15 23rd October 2005 08:54 PM
Stax SRA-12S ObliVion Solid State 0 12th July 2004 02:29 PM
Stax SRA-12S ObliVion Solid State 0 12th July 2004 02:23 PM


New To Site? Need Help?

All times are GMT. The time now is 07:51 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