TO-3 SYMASYM - Page 78 - diyAudio
Go Back   Home > Forums > Commercial Sector > Group Buys

Group Buys Members group buys

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 11th October 2013, 08:48 PM   #771
diyAudio Member
 
mrsavage's Avatar
 
Join Date: Nov 2011
Location: Columbus, Ohio
Default Would to order PCB's if not to lates

I would like following from the TO-264 / TO-3PBL SYMASYM Group Buy:

(1) Four (4) AMP PCB's
(2) Four (4) SKPR PCB's
(3) Eight (8) PSU PCB's

Let me know if it's not to late. Take care.
  Reply With Quote
Old 12th October 2013, 10:28 AM   #772
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Michael, I will send you an EMail.

Rudi
  Reply With Quote
Old 23rd October 2013, 06:00 PM   #773
diyAudio Member
 
mrsavage's Avatar
 
Join Date: Nov 2011
Location: Columbus, Ohio
Default Any news about Group Buy's for TO-264 / TO-3PBL SYMASYM PCB's?

Any news about a future Group Buy's for TO-264 / TO-3PBL SYMASYM PCB's?
I'm interested in both versions.
  Reply With Quote
Old 16th January 2014, 01:51 PM   #774
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Gentlemen, SYMASYM-friends, I have received several feedbacks concerning my currently offered TO3/SYMASYM - PCBs (Rephil, Jorge, ... for example), telling me that my SYMASYM sounds best
(compared to nearly every competitor - DIY-Amplifier ) and that an audible improvement will not be possible .

Will it not be?

According to my experience: an amplifier sounds at is best, if the PSU (the reservoir CAPs !) is mounted as close as possible to the consumers (the output transistors),
and therefore did a "final" layout of the (my) SYMASYM.

Click the image to open in full size.

http://abload.de/img/njw-symasym_v3-topviedasww.png

I have mounted the big reservoir CAPs on top of the PCB, the output-transistors (NJW-transistors, the MJE-drivers and the TEMPCO - BD139) being mounted below the PCB and hope: this is it!
The Signal-GND (on the bottom of the PCB) will not be affected by the "noise" inserted by charging / dis-charging the Solid-GND (on top of the PCB).

I am sorry that my Gerber-File-Viewer (GERBV) is not able to present the layout of this PCB correctly. There are a lot of horizontal black, small tracks to disturb the overall view!

The PCB incorporates CAP-Multipliers to provide smoothed frontend-voltages (consuming less than 15mA per rail) - as you can see (for example) on the bottom right of the PCB.

I will go and order 10 of these PCBs on the the coming weekend. Six of them are already reserved.
If somebody of you will this PCB a try (since they are prototypes) and wants to have it (price is 12€ per PCB - shipping is 3.45€ worldwide): 4 of these PCBs are not yet reserved.

Best regards - Rudi_Ratlos

P.S.: The size of the PCB is 150x100mm.
Attached Images
File Type: png NJW-SYMASYM_V31-topview.PNG (213.0 KB, 392 views)

Last edited by Rudi_Ratlos; 16th January 2014 at 02:19 PM.
  Reply With Quote
Old 17th January 2014, 01:03 PM   #775
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
concerning my currently offered TO3/SYMASYM - PCBs (Rephil, Jorge, ... for example), telling me that my SYMASYM sounds best
what version are you referring to?
This new layout does not look like a To3.
Are those To247 or To264 Power Devices?
__________________
regards Andrew T.
  Reply With Quote
Old 17th January 2014, 02:28 PM   #776
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Andrew, I am referring to the SYMASYM-version as show in post #764.
It uses 2 pairs of TO3 - MJ21195G/MJ21196G as output transistors.

The SYMASYM sounds very well with those TO3-transistors.

My current effort is to include part of the PSU (reservoir-capacitors) on the amplifier's PCB.
Since I couldn't come up with a reasonable layout using TO3s, I changed to NJW0281G/NJW0302G (TO-3P case) and will mount them beneath the PCB.

This way the "hot area" - charging and de-charging the reservoir caps - is on top of the PCB and does not (this is what I think) affect the "small signal" area,
which is on the bottom of the PCB and which is fed by 2 cap-multipliers.

Best regards - Rudi_Ratlos

P.S.: All of the "new" PCBs are already reserved.
  Reply With Quote
Old 18th January 2014, 10:39 AM   #777
loek is offline loek  Netherlands
diyAudio Member
 
Join Date: Feb 2005
Location: The Hague
Maybe better that the left 22R resistor has a little more space like the right one?
Nice design Rudy!!
  Reply With Quote
Old 18th January 2014, 01:14 PM   #778
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Loek: the 22R resistors around the input are only used, if you operate the SYMASYM from an "active PreAmplifier (Gain >0)" .
In case you use a passive PreAmplifier (Source Selection + potentiometer), the 22R resistors are replaced by wires (will be bridged).

Best regards - Rudi_Ratlos

P.S.: In the meanwhile I have the enhanced (?) the on-top reservoir-capacitor layout by a new one, since I have had some luck and "inherited" a couple of "ELNA for AUDIO caps" for a very nice offering.
I wonder, how the NJW0 transistors will sound as compared to the TO3.

Best regards - Rudi_Ratlos
Attached Images
File Type: jpg SYMClassA 021.jpg (880.3 KB, 304 views)
File Type: png Image3.png (23.8 KB, 287 views)
File Type: png image2wak1q.png (252.8 KB, 232 views)

Last edited by Rudi_Ratlos; 18th January 2014 at 01:18 PM.
  Reply With Quote
Old 18th January 2014, 01:17 PM   #779
diyAudio Member
 
meanman1964's Avatar
 
Join Date: Oct 2006
Location: Belgium the land of chocolate
Rudi,
As always nice layout
  Reply With Quote
Old 18th January 2014, 01:25 PM   #780
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Patrick: I have given my word to somebody and will show him that the sound of the SYMASYM will be improved (will be "quicker"), if you mount the PSU-reservoir-CAPs
very close to the consumers (the output transistors).

Best regards - Rudi_Ratlos

P.S.: I will not offer this layout as a "Group-Buy - layout". I only did it to approve my assumption.

Last edited by Rudi_Ratlos; 18th January 2014 at 01:39 PM.
  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
Symasym PCB Khron Solid State 58 17th May 2012 08:18 AM
Troubleshooting your Symasym anatech Solid State 235 22nd September 2011 10:40 PM
Help with Symasym jandr49 Solid State 6 18th September 2011 01:13 PM
Symasym 5.3 jandr49 Solid State 2 16th April 2010 04:03 PM


New To Site? Need Help?

All times are GMT. The time now is 10:30 PM.


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