Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 26th November 2001, 11:40 AM   #11
diyAudio Member
 
Join Date: Oct 2001
Location: Alvesta, Sweden
Quote:
The ZAPsolute Mk4 is a kit form (or handbuilt ready to play) high end Pure Class A amplifier, configurable in 50, 78 or 118 Watts in 8 Ohms Class A. Capable of driving down to 1 Ohm with 6 times higher power. (Shown on picture).

The End Millennium, a 100 - 300 Watt Class A/B amplifier in kit form, with short circuit protection, DC servo, easy to build, but with sound quality comparable to the best available factory made amplifiers in the world. Built with high grade capacitors, high quality cabling and a huge power supply, with The End Millennium You'll have the amplifier to knock out Your freinds' 10 times higher priced factory built amps.

Like I say, I'd like to try an efficient class A design of the Millenium using the Nelson Pass patent.As to your remarks about the 'GAS the Nine', the Sumo Nine was designed by GAS founder James Bongiorno. And it did have differential inputs. And it also had horrible capacitors. Unbypassed polarized electrolytics in the signal path, ceramics everywhere, and no power supply bypassing. It's a wonder it sounded as good as it did. But I believe the topology was sound. I just picked up one to play with. I'm sure I will be able to make it sound vastly better with a little bit of effort. Have you seen the schematic on one of these? It's two single ended output stages bridged and driven differentially from a common diff pair. A Wiggins Circlotron.
Sorry for my fault on Millenium. Not looking closely at Millenium speces I assumed it was class A like ZAPsolute.
I shared room at Arken (the biggest audio fair in scandinavia) with Golden Age Music which at the time was distributor of LCaudio's products in Sweden. We had both Zapsolute and Millenium in our room.
Both where outperformed quite much by Spark top tubeamps.
I still say that Millenium is not very good.
Since Millenium is designed to accept both single-ended signal and balanced it is a perfect opportunity for you to find out by yourself that differential stages need to get a balanced signal in if you only use one side for output.
After you have tested that I suggest you change input stage to the one used in the early Zapsolute amplifiers which is much better sounding with single-ended output.

Yes, I have seen the schematic for The Nine, but can't comment on it since I sold it a long time ago.

Please don't think I dislike differential stages.
You seems to have hung up on that.

Good luck with your Millenium.
Janne
  Reply With Quote
Old 26th November 2001, 11:42 AM   #12
diyAudio Member
 
Join Date: Oct 2001
Location: Alvesta, Sweden
Correction

After you have tested that I suggest you change input stage to the one used in the early Zapsolute amplifiers which is much better sounding with single-ended INPUT.

Janne

  Reply With Quote
Old 26th November 2001, 08:12 PM   #13
Dave is offline Dave  New Zealand
diyAudio Member
 
Join Date: Oct 2001
Location: New Zealand
Hedlund,

Nearly all amplifier designs (A75, Aleph Series, Leach AMP) use a differential input stage (most likely driven by a single-ended input) with the output/driver stage been driven from only one phase of the differential amplifier's output. Do you think this topology is flawed?
  Reply With Quote
Old 26th November 2001, 08:31 PM   #14
diyAudio Member
 
Join Date: Oct 2001
Location: Alvesta, Sweden
Dave,

Of course they are not. Some of them sound good, but I state than any of them will sound better if the input is balanced.
I have come to this result over and over again with my own constructions as well as commercial amplifiers using this type of input stage.
Mostly I go to the bottom with my constructions modifying countless of times until I get the best possible sound and when using single-ended input it always ends with a complementary single-ended input stage.

Janne


  Reply With Quote
Old 27th November 2001, 07:04 AM   #15
ergo is offline ergo  Estonia
diyAudio Member
 
Join Date: Mar 2001
Location: Tallinn, Estonia
To: Hedlund.

You mention the early versions of Zapsolute. Do you have the schematics of these versions and can you perhaps mail it to me. I own The End Millennium kit based amp at the moment and I'm also working on my own class A project.. I would be very interested in studing the evolution of the circuit compared to current ZAP and figure out why they decided to change this or that..

Rgds
Ergo
  Reply With Quote
Old 27th November 2001, 07:31 AM   #16
diyAudio Member
 
Join Date: Oct 2001
Location: Alvesta, Sweden
Ergo,

Zapsolute started as a DIY project in the scandinavian HiFi magazine High Fidelity around 5 years ago, before the designer had started LC Audio.
Mail me your fax number so I can send copies of the articles.
If I remember right there was three or four of them.
Unfortunalty they are i swedish, but I will try to write a short explanation for you.

jan@hedlund.se

Janne
  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
Please check this out Vaughan Subwoofers 15 29th January 2009 04:03 PM
can someone please check this out impsick Chip Amps 20 9th February 2007 03:12 PM
please check me... bogdan_borko Solid State 7 9th August 2006 01:06 AM
PSU check ifrythings Power Supplies 7 21st April 2006 04:56 AM
my first amp, please could someone check it??? Si992 Solid State 17 15th March 2005 09:05 PM


New To Site? Need Help?

All times are GMT. The time now is 04:41 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