TCJ - Evolve simply and good amps idea - 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
Reply
 
Thread Tools Search this Thread
Old 25th May 2005, 05:43 AM   #1
diyAudio Member
 
Join Date: Mar 2004
Location: Krakow
Default TCJ - Evolve simply and good amps idea

Dear Friends!

I would like to share with a few amplifiers ideas (some of the are playing already!).
The ideas were born after reading 2004 blogs by John Broskie in TCJ.
Very similar ideas could be found on the sites of Evolve Power Amplifiers.
The pdf file consists of 3 projects with the results of simulations.

First two have 75mV 1 kHz sine wave at the input. The transistors are 2n2955/3055. Those are only ideas.

Third has at the input 1V 1kHz sine wave. The transistors are IRF540/9540. This amp I have built in two versions:
• First – power supply voltage only +-13V, signal directly from a source, potentiometer, connected to the 10kOhm resistors (in the middle). NFB resistors 12kOhm. In power supply ordinary parts. Sound: GREAT from the start. Detailed and not grainy. quick, deep, low bass, wide stage, wooden saxophones, vocals not sharp. It works stable from 11-2004. Rest current only 200 mA per hexfet.
• Second: - As a preamplifier connected via a paper in oil capacitor, I have used E88CC supplied from only +43VDC power supply (!). 180 Ohm at the cathode, 4.7 kOhm at the anode. The capacitor at the solid state side was terminated to a ground via the 380 kOhm resistor. Power supply +-23V, super fast diodes, battery of paralleled good, fast capacitors. Rest current 350 mA per hexfet.
Now some notes about the sound: VERY good bass, detailed mids and highs, deep stage, but a little too bright sound. Saxophones are a little metallic, not like in tube amps when you could hear the wood.
In a comparison with a tubes it sounds metallic and bright. I am used to tubes and for the first hearing I was disappointed, and thought that it sounded like kick in the balls (Carlos will be happy reading this). But after some time amplifier started to sounded more smooth and culture. Now I like it especially that is better of any solid state amplifier that I have ever heard.

I am curious of your impressions after building of those simply circuits!!!
Attached Files
File Type: pdf ideas tcj pp.pdf (67.2 KB, 784 views)
__________________
regards, Pawel
  Reply With Quote
Old 25th May 2005, 09:27 PM   #2
diyAudio Member
 
Join Date: Jul 2002
Location: Naptown
I too have seen the circuit that you mention on the Evolve site. I even considered building a version. Nice to know that you did it successfully!

I would love to see the schematic of the Second version with FETS including the tube stage.

-Doug
  Reply With Quote
Old 26th May 2005, 11:31 AM   #3
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Yessss!...yeahhh!...good!.... very good to see you here Pada

And of course i like the things you do...of course.

And i will hear them...also of course.

Carlos
__________________
These words sounds alike English..but they are not.. these are words without meaning, just sounds made by humans; https://www.youtube.com/watch?v=_X_7iMHugXM
  Reply With Quote
Old 26th May 2005, 12:20 PM   #4
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default I was watching....

Yes i did it!

Carlos
Attached Images
File Type: jpg this is good!.jpg (92.3 KB, 947 views)
__________________
These words sounds alike English..but they are not.. these are words without meaning, just sounds made by humans; https://www.youtube.com/watch?v=_X_7iMHugXM
  Reply With Quote
Old 26th May 2005, 12:21 PM   #5
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default And also observing with care....

I am doing already that.

Carlos
Attached Images
File Type: jpg very interesting.jpg (95.5 KB, 862 views)
__________________
These words sounds alike English..but they are not.. these are words without meaning, just sounds made by humans; https://www.youtube.com/watch?v=_X_7iMHugXM
  Reply With Quote
Old 26th May 2005, 12:23 PM   #6
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Interesting, normally sounds nice...

Those more simple designs, more close with the wire with gain.....are normally very good.

regards,

Carlos
Attached Images
File Type: jpg sounds nice.jpg (85.6 KB, 842 views)
__________________
These words sounds alike English..but they are not.. these are words without meaning, just sounds made by humans; https://www.youtube.com/watch?v=_X_7iMHugXM
  Reply With Quote
Old 26th May 2005, 12:25 PM   #7
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Yessss.... i like all those circuits, including Susan Parker designs

But transformer are heavy when fall down into our fingers.....hummm this is not too much stimulating to me.

regards,

Carlos
Attached Images
File Type: jpg off-set.jpg (60.0 KB, 933 views)
__________________
These words sounds alike English..but they are not.. these are words without meaning, just sounds made by humans; https://www.youtube.com/watch?v=_X_7iMHugXM
  Reply With Quote
Old 30th May 2005, 06:16 AM   #8
diyAudio Member
 
Join Date: Mar 2004
Location: Krakow
Default Re: Yessss.... i like all those circuits, including Susan Parker designs

Quote:
Originally posted by destroyer X
But transformer are heavy when fall down into our fingers.....hummm this is not too much stimulating to me.

regards,

Carlos

Hi Carlos,
low power transistors = low offset,
in practice I had to regulate the offset paralleling one of the nfb resistors with another resistor (rather high value ~1MOhm).
__________________
regards, Pawel
  Reply With Quote
Old 30th May 2005, 06:23 AM   #9
diyAudio Member
 
Join Date: Mar 2004
Location: Krakow
Quote:
Originally posted by Dozuki
I too have seen the circuit that you mention on the Evolve site. I even considered building a version. Nice to know that you did it successfully!

I would love to see the schematic of the Second version with FETS including the tube stage.

-Doug

Hi Doung,
the tube section is not a realy sophisticated circuit:
common cathode circuit
with a res 180 Ohm as cathode res,
and 4.7 kOhm res at anode.
The signal is leaded by paper in oil capacitor to the current amp.
the input signal is connected to a e88cc's grid via a 470 kOhm Alps potentiometer.

Luke, use the force, and imagine this

Now I do not have chance to send this circuit at the Forum, I will do it later.
__________________
regards, Pawel
  Reply With Quote
Old 30th May 2005, 12:02 PM   #10
diyAudio Member
 
darkfenriz's Avatar
 
Join Date: Jun 2004
Location: Warsaw
Cześć
When you re-write schematics but change ground with output symbols (so that supply is no longer floating and output is emitter follower) all starts to look quite ordinary. Only the input signal is kind of 'bootstraped'.
what feedback circuit do you use?
  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
Why do some Bogan amps sound so good as guitar amps? amperex Instruments and Amps 7 22nd June 2006 11:46 AM
Evolve Power Amps lawbadman Solid State 2 1st February 2006 06:31 AM
Evolve Amps 100W+100W Stuff 4 Sale WALTER BURKHARD Swap Meet 4 8th June 2005 10:57 AM
Simple 6BM8 at Evolve Power Amps? amt Tubes / Valves 15 12th February 2004 06:54 PM


New To Site? Need Help?

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