600:10k line stage transformers any use? - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, 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 4th October 2013, 11:50 AM   #1
diyAudio Member
 
Join Date: Jun 2007
Default 600:10k line stage transformers any use?

A musician friend of mine gave me a handful of these transformers:

Altronics - M0705 600 Ohm : 10k Ohm Shielded Microphone Transformer

The wiring diagram is here:
http://www.altronics.com.au/download...eets/M0705.pdf

What kind of purpose would these serve for home/diy audio?
  Reply With Quote
Old 4th October 2013, 11:53 AM   #2
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
line amp with XLR output....
__________________
the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
  Reply With Quote
Old 4th October 2013, 12:04 PM   #3
diyAudio Member
 
Join Date: Jun 2007
Thanks. I have a preamp with an XLR output, also a dac which has a passive I/V stage, so the transformers might be of some use.

The 'datasheet' has so little detail! What is this transformer actually doing (besides impedance matching)? Is there any gain provided?
  Reply With Quote
Old 4th October 2013, 12:11 PM   #4
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
if you use the 600 ohm side as input, then you have gain....
you can try to use that for an MC step-up transformer....
__________________
the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
  Reply With Quote
Old 4th October 2013, 12:29 PM   #5
diyAudio Member
 
Join Date: Jun 2007
Ok great, how do we calculate the gain?
For example, my balanced dac puts out 1ma per channel, with 10R iv resistors we get: 10 x 0.001 = 0.01vrms. Tiny!
At the moment I run this into a 30db gain tube amp, which drives a push pull power amp (100k input impedance) quite well.

Could these transformers be used to replace the line stage tube pre?
  Reply With Quote
Old 4th October 2013, 12:52 PM   #6
john65b is offline john65b  United States
diyAudio Member
 
john65b's Avatar
 
Join Date: Jan 2005
Location: Chicago
Front end Phase splitter for tube amp? Isn't this like a Lundahl LL1690? Like what would be used for the Pete Millet Universal Driver board?

Heck, if so, I may want a pair for a couple experiments....too bad I am across teh pond.

Thinking of using the Edcor 600/10k or 10k/10k transformers too...
__________________
All right, but apart from the sanitation, medicine, education, wine, public order, irrigation, roads, the fresh water system and public health, what have the Romans ever done for us? Life of Brian

Last edited by john65b; 4th October 2013 at 01:01 PM.
  Reply With Quote
Old 4th October 2013, 01:52 PM   #7
diyAudio Member
 
Join Date: Jun 2007
I have a few lundahl trannies (not for the same purpose), so should be in a position to give a good comparison on the sound signature.....if I can find a good use for these units!!

Out of interest, how would one wire up an unbalanced input and output to these trannies?
  Reply With Quote
Old 4th October 2013, 05:25 PM   #8
diyAudio Member
 
Join Date: Nov 2008
Location: Oakmont PA
Sqrt(10000/600) is about 4. These are input transformers, not enough size for output.
  Reply With Quote
Old 5th October 2013, 12:08 AM   #9
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
Quote:
Originally Posted by lordearl View Post
Ok great, how do we calculate the gain?
For example, my balanced dac puts out 1ma per channel, with 10R iv resistors we get: 10 x 0.001 = 0.01vrms. Tiny!
At the moment I run this into a 30db gain tube amp, which drives a push pull power amp (100k input impedance) quite well.

Could these transformers be used to replace the line stage tube pre?

there are other reasons for using the traffo aside from gain..
galvanic isolation can be useful in eliminating ground loops...
__________________
the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
  Reply With Quote
Old 5th October 2013, 01:53 AM   #10
diyAudio Member
 
Join Date: Jun 2007
Ok well I'll test it out on an old linestage and see how they sound. Whhat would the wiring be for an unbalanced input/output?
  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
600:600 ohm output transformers for v-out DAC - $40 for 2 wireswithgain Swap Meet 11 5th November 2013 10:53 AM
FS: LM49710/LM49600 Amp (The Wire-ish) and +-15v Bipolar supply, 600:600 Transformers wireswithgain Swap Meet 13 14th August 2013 02:54 PM
FS cinemag transformers nickel CMOQ-2H 600:600 Gluca Swap Meet 10 6th March 2013 06:01 PM
FS/Trade Hammond 850G 150/600:150/600 Line Isolation/Hybrid Matching Transformers VictoriaGuy Swap Meet 0 3rd August 2011 09:29 PM
EDCOR XSM 10K/10K Transformers wushuliu Swap Meet 3 15th January 2011 07:24 PM


New To Site? Need Help?

All times are GMT. The time now is 11:56 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