TO-3 SYMASYM - Page 60

cjkpkg · 27th October 2012, 02:38 AM

cjkpkg symasym

Had to post a video...

joshvi · 27th October 2012, 05:46 AM

This video is private !

joshvi

cjkpkg · 27th October 2012, 10:53 AM

Whoops....fixed now its public

cjkpkg · 28th October 2012, 04:55 PM

I have been enjoying SYMASYM all weekend with no issues.

Thank you again for all your patience and suggestions. The Aikido pre amp is a perfect match and the combination works well together.

I look forward to having all the caps break in which can only improve upon what is already an extremely good sounding amp.

RKH · 29th October 2012, 05:17 AM

What tube complement are you using in your Aikido pre amp? I ask, because I'm still looking for the 'right' combination when feeding a solid state amp, such as the Symasym (currently under construction for me.)

Thanks,
Ryan

cjkpkg · 29th October 2012, 04:46 PM

My Aikido preamp is 6CG7 input with 5687 output. It is a dedicated 5687 output board but the inputs are interchangeable with similar like 6dj8, 6922, 6n1p etc...

The 6CG7 is lower gain of around 10 which works perfectly.

Coupling caps are Auricap 0.68uF bypassed by Russian PIO 0.22uF.

Junie · 6th November 2012, 01:38 PM

Hi Rudi,

PCB's already populated and waiting for few parts from Farnell, please let me know if the heatsinks shown here are adequate or not. cheers.

Thanks in advance,
Junie

Rudi_Ratlos · 01:42 PM

Junie, the heatsinks are adequate.
Best regards - Rudi

P.S.: Wishing you success with your SYMASYM!

Junie · 6th November 2012, 02:09 PM

Thanks Rudi.

I will keep you posted on my progress. regarding the input trannies, Jfet is unobtanium here in dubai you mentioned that any low noise trannies will do the job but which one is favorable as your "CHOICE"?

Regards,
Junie

cjkpkg · 6th November 2012, 03:10 PM

I have been running symasym now for many days. I was tracking down a buzz that I eventually traced to my source. In doing so I plugged in my Moskido power amp - Aikido front end with a single pair of BUZ901/BUZ906 MOSFETS per channel in class A. The amp runs at 26V and 1.25A per channel.

What I noticed was that the bass on the Moskido goes much deeper. Now both amps sound amazing and are silent - it is just that I think I like the bass out of the Moskido better.

Are there different values of maybe the feedback cap and resistor to try and see if bass gets more to where I like it? Current values are 10pF and 22K.

Also I have increased R36 to 1K to reduce the gain a little due to my preamp.

To reiterate, I am not unhappy with the result, I would just like to explore how to change the bass more to my liking.

29th October 2012, 05:17 AM	#595
RKH diyAudio Member Join Date: Sep 2002 Location: Colorado, USA	What tube complement are you using in your Aikido pre amp? I ask, because I'm still looking for the 'right' combination when feeding a solid state amp, such as the Symasym (currently under construction for me.) Thanks, Ryan __________________ Lighten up while you still can ...

6th November 2012, 01:40 PM	#598
Rudi_Ratlos diyAudio Member Join Date: Jun 2009 Location: Hamburg / Germany	Junie, the heatsinks are adequate. Best regards - Rudi P.S.: Wishing you success with your SYMASYM! Last edited by Rudi_Ratlos; 6th November 2012 at 01:42 PM.

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27th October 2012, 02:38 AM	#591
cjkpkg diyAudio Member Join Date: Aug 2008 Location: Roswell GA	cjkpkg symasym Had to post a video...

27th October 2012, 05:46 AM	#592
joshvi diyAudio Member Join Date: Oct 2008	This video is private ! joshvi

27th October 2012, 10:53 AM	#593
cjkpkg diyAudio Member Join Date: Aug 2008 Location: Roswell GA	Whoops....fixed now its public

28th October 2012, 04:55 PM	#594
cjkpkg diyAudio Member Join Date: Aug 2008 Location: Roswell GA	I have been enjoying SYMASYM all weekend with no issues. Thank you again for all your patience and suggestions. The Aikido pre amp is a perfect match and the combination works well together. I look forward to having all the caps break in which can only improve upon what is already an extremely good sounding amp.

29th October 2012, 04:46 PM	#596
cjkpkg diyAudio Member Join Date: Aug 2008 Location: Roswell GA	My Aikido preamp is 6CG7 input with 5687 output. It is a dedicated 5687 output board but the inputs are interchangeable with similar like 6dj8, 6922, 6n1p etc... The 6CG7 is lower gain of around 10 which works perfectly. Coupling caps are Auricap 0.68uF bypassed by Russian PIO 0.22uF.

6th November 2012, 01:38 PM	#597
Junie diyAudio Member Join Date: Sep 2010 Location: Dubai, UAE	Hi Rudi, PCB's already populated and waiting for few parts from Farnell, please let me know if the heatsinks shown here are adequate or not. cheers. Thanks in advance, Junie

6th November 2012, 02:09 PM	#599
Junie diyAudio Member Join Date: Sep 2010 Location: Dubai, UAE	Thanks Rudi. I will keep you posted on my progress. regarding the input trannies, Jfet is unobtanium here in dubai you mentioned that any low noise trannies will do the job but which one is favorable as your "CHOICE"? Regards, Junie

6th November 2012, 03:10 PM	#600
cjkpkg diyAudio Member Join Date: Aug 2008 Location: Roswell GA	I have been running symasym now for many days. I was tracking down a buzz that I eventually traced to my source. In doing so I plugged in my Moskido power amp - Aikido front end with a single pair of BUZ901/BUZ906 MOSFETS per channel in class A. The amp runs at 26V and 1.25A per channel. What I noticed was that the bass on the Moskido goes much deeper. Now both amps sound amazing and are silent - it is just that I think I like the bass out of the Moskido better. Are there different values of maybe the feedback cap and resistor to try and see if bass gets more to where I like it? Current values are 10pF and 22K. Also I have increased R36 to 1K to reduce the gain a little due to my preamp. To reiterate, I am not unhappy with the result, I would just like to explore how to change the bass more to my liking.