Can you tell me about these zero autoformers? - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 21st June 2003, 07:06 AM   #1
JZatopa is offline JZatopa  United States
diyAudio Member
Join Date: May 2003
Location: Chicago
Default Can you tell me about these zero autoformers?

what is the difference between a troid (I'm misspelling that) transformer and the zero autoformers? Is this guy getting rich on idiots who don't take the time to research or is this a new amazing cure all?
  Reply With Quote
Old 21st June 2003, 07:43 AM   #2
dhaen is offline dhaen  Europe
diyAudio Moderator Emeritus
dhaen's Avatar
Join Date: Jun 2002
Location: U.K.
Default Bargain?

Looks like nothing more that an impedance matching transformer.
The price of the "New" ZERO-Autoformers is $450/pair, and includes free shipping in the 48 States.
Free shipping - that's generous of them
  Reply With Quote
Old 21st June 2003, 08:18 AM   #3
diyAudio Member
analog_sa's Avatar
Join Date: Aug 2002
Location: Cascais
Well, not likely to find many buyers on this forum but the guy is amazingly honest in his discourse - no attempt to hint at superior knowledge or paranormal phenomena. The autoformers surely do something for the sound, even if i am a bit sceptical about their total transparency. We should be thankful for the experimenter's tips on the site; seems like a really simple job to wind a similar pair. As to pricing - charge whatever the market is willing to pay - anyone has a problem with that?

  Reply With Quote
Old 21st June 2003, 02:03 PM   #4
paulb is offline paulb  Canada
diyAudio Member
Join Date: Jun 2001
Location: Calgary
This was an article in AudioXpress magazine in the Jan 2003 issue. He set out to solve a particular problem in his own system and decided to do a small production run. No magic unidirectional crystals or anything. Just impedance matching.
  Reply With Quote
Old 22nd June 2003, 11:19 PM   #5
diyAudio Senior Member
fdegrove's Avatar
Join Date: Aug 2002
Location: Belgium

Read the company history, please.

The owner, Paul Speltz, proposed this as a solution to Atmasphere OTL owners at first.
Afterwards he probably realised the market niche for it and stepped into business with it.

Not a bad idea but overpriced from where I'm sitting...than you may ask yourself, what's the point of having an OTL amp if you need a xformer anyway?

Well, the short one on that is that OTLs aren't really fit to drive low impedance speakers ( though much better than most people think as long as the impedance is fairly constant) and Circlotrons aren't that good an idea for an OTL either...hence the Zero.

  Reply With Quote
Old 22nd June 2003, 11:21 PM   #6
JZatopa is offline JZatopa  United States
diyAudio Member
Join Date: May 2003
Location: Chicago
I know people using these to take their 8ohm speakers and use them at 4 ohms. All of them have a decware zen amp though.
  Reply With Quote
Old 23rd June 2003, 02:42 AM   #7
diyAudio Member
Join Date: Dec 2001
Location: Earth
i read the site, and feel it is very usefull for tubes in se and otl but not for the price
the difference between a toroid and the zero autoformers is that the zero is design for audio band, most toroids do reach high frequencies but they sound little edgey on the high stuff. This comes from experience in using them and from a friend who uses this also in phase splittering and input transformer.
The good thing is the dampening factor would increase as a high load is present. Similar to increasing the impedance ratio of a tube output trans. Many people prefer using a high impedance transformer as it gives better control of the music
I think i have a transformer that is 2:1, i going to try out and see the benefits.
I speculate that my power would drop using tube pp but should get much better dampening factor.
I would report back on this
  Reply With Quote


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
Anyone compared electra-print SE:PP interstages to electra-print PSA-2 autoformers zobsky Tubes / Valves 2 27th August 2016 10:09 PM
Supravox 215-2000 EXC OB, Tribute autoformers and Visaton TL16H for sale on Ebay ligascon Swap Meet 0 24th February 2009 02:04 PM
MC 352 Autoformers Jai Solid State 1 10th July 2006 02:34 PM
Autoformers (again??!) adharvey Tubes / Valves 10 14th October 2003 07:15 PM
Is this statement about autoformers correct? Saurav Parts 2 30th September 2003 05:06 PM

New To Site? Need Help?

All times are GMT. The time now is 09:37 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2