Stee has sent me Isy boards - diyAudio
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
Thread Tools Search this Thread
Old 31st August 2009, 11:21 AM   #1
diyAudio Member
destroyer X's Avatar
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Stee has sent me Isy boards

I have already tried the circuit into the protoboard, and have listened..sounded very good, despite in the simulation the distortion is higher than 0.2% THD....but sounded very nice...had focus... a lot of details, strong treble and fair basses..... voices were normal, nothing exceptional in that frequency range.

Some people do not believe and do not respect Stee designs, you should try to listen by yourselves, to evaluate by really behave DIY.

Near future i will assemble into Stee boards to see if i will have problems...for sure they will not present problems, because the mess i had into the protoboard, is more oscilation addicted, than Stee boards.

Thank you very much Stee.... by your kindness to provide me boards and to listen (and listen) the evaluations i have sent by mail.

Details from Stee can be found into our forum. he has some threads opened.


Attached Images
File Type: jpg Stee.jpg (584.3 KB, 68 views)
  Reply With Quote
Old 31st August 2009, 02:20 PM   #2
diyAudio Member
destroyer X's Avatar
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Isy (easy) amplifier is interesting, as uses power transistors into the driver's...

... position.... this way, he is avoiding problems of gain.

We know that PNP and NPN use to be different in gain..hard to match them..but, if you combine an NPN and a PNP in a single rail...and of course a PNP and an NPN in the other rail, you will match the gain into the rails.

Imagine a gain 50 into the npn...and a gain of 100 into the pnp.... the multiplication results into 5000 of gain as result of that combination.

This way you gonna have 5000 of gain in upper rail and 5000 of gain in the lower rail.

If not using that, the positive rail will face 2500 of gain when the negative rail will face 10000.

Despite of this advantage, the distortion is higher (numbers) compared to good AB works in AB and sounds fine despite of that.

The second advantage is that may work better reducing the main amplifier gain and including a Fet amplifiers in the input, or in the VAS position.....or including an operational amplifiers into the input.

I do not like the idea to include the Op amp, as inside the op amp we have entire amplifier..we have differential, VAS, drivers and output..and despite nice numbers, i think (I believe and also i have tested/listened) they produce a sonic "signature" into the reproduction...and each chip with their own you will never know your op amp choice was the better..will be searching and searching and replacing and replacing till the end of your lifetime always having doubts about.

Stee is good designer...he is creative and do not want to repeat the same old song..reason why i have strong appreciation/respect on him.

Stee is fast, he does things fast, he is clever and has special vision about audio... equiped as a cat.. fast, clever and great vision!


Attached Images
File Type: jpg Fast, clever and has good vision.jpg (667.3 KB, 14 views)

Last edited by destroyer X; 31st August 2009 at 02:26 PM.
  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
L/R Boards and Matched IRFP240 Boards for Aleph/ A-X lgreen Swap Meet 7 25th August 2009 04:56 AM
FS: Conrad Heatsinks;.... 'PASS' B1 boards w/JFETS;...... F4 AMP & PSU boards cowboy99 Swap Meet 5 25th August 2009 02:39 AM
Pass Aleph 1.7 boards, Zhaolu 2.5A, P700 VRDS, UGS PS boards, dac chips analog_sa Swap Meet 4 14th March 2009 05:29 PM
FT: Pass boards for P101 boards bjefferys Swap Meet 1 26th March 2006 07:39 PM

New To Site? Need Help?

All times are GMT. The time now is 08:15 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2