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Old 27th October 2012, 02:38 AM   #591
cjkpkg is offline cjkpkg  United States
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cjkpkg symasym

Had to post a video...
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Old 27th October 2012, 05:46 AM   #592
joshvi is offline joshvi  India
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This video is private !
joshvi
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Old 27th October 2012, 10:53 AM   #593
cjkpkg is offline cjkpkg  United States
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Whoops....fixed now its public
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Old 28th October 2012, 04:55 PM   #594
cjkpkg is offline cjkpkg  United States
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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.
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Old 29th October 2012, 05:17 AM   #595
RKH is offline RKH  United States
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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
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Old 29th October 2012, 04:46 PM   #596
cjkpkg is offline cjkpkg  United States
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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.
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Old 6th November 2012, 01:38 PM   #597
Junie is offline Junie  Philippines
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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.

Click the image to open in full size.

Thanks in advance,
Junie
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Old 6th November 2012, 01:40 PM   #598
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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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Old 6th November 2012, 02:09 PM   #599
Junie is offline Junie  Philippines
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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
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Old 6th November 2012, 03:10 PM   #600
cjkpkg is offline cjkpkg  United States
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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.
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