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Old 5th February 2013, 07:13 PM   #931
VT67 is offline VT67  Belgium
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This is where am at with both PCB's.
Still waiting for some parts.

Regards
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Old 8th February 2013, 10:47 PM   #932
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Can anyone point me to the Bias adjustment procedure of the Symef type 1?

Thanks
Do
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Old 8th February 2013, 11:02 PM   #933
billyk is offline billyk  United States
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Still waiting... output transistors on back order still. Don't want to start till I have everything I need. Grrrrr
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Old 8th February 2013, 11:40 PM   #934
routhun is offline routhun  United States
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For Bias settings check post #822. Set the bias trimmer all the way back to counter clock wise, and rotate slowly clockwise until the voltage across R14 (any of the emitter resistors of outputs) to 23mv. Increase the bias slowly in steps of 5mv at a time monitoring the temperature of the heat sinks. You would like to wait around 2min for each step this gives some time for the amp the settle down the bias currents.

If you are powering up for the first time, set the bias trimmer to Counter Clock Wise and use a series light bulb in series with mains or 10ohm 1/4W resistors in series with DC power supplies to the amp. If there are any issues this will prevent the damage of output transistors.

Hope this helps.
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Old 9th February 2013, 01:43 AM   #935
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Thanks guys for the quick reply!

Harrison, you will be happy... After almost a year, I've finally managed to finish the amp modules completely!

They're both playing music right now as burn in. Will test shortly.

Ciao!
Do
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DACs : TPA Buffalo II + OPC's NTD1 I/V | TPA OPUS + IVY III | Moon 380D DSD Speakers : Jim Holtz Statements | Astasia SD | Tubasson Mark 2
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Old 10th February 2013, 04:55 AM   #936
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I finally did most of the burn in and decided to hook it up to my DCB1, Wolfson DAC and Astasia speakers. I'm really impressed by the musicality of this amp and the overal tonal balance. Female voice are really well rendered. Lots of breathing room between instrument and the soundstage has a very good width but maybe not as deep as my ML-2 or B24.

I might just go for the new version of the amp and see if there is improvement. Anyone can comment on the newest PCB design (sound signature)?

Thanks
Do
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Old 10th February 2013, 12:22 PM   #937
VT67 is offline VT67  Belgium
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This is how far I've got with both boards, still waiting for some parts.

Regards
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Old 10th February 2013, 12:32 PM   #938
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Looking good
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Old 10th February 2013, 12:36 PM   #939
VT67 is offline VT67  Belgium
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@pinnocchio

Does the amp generate much heat?

Regards
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Old 10th February 2013, 02:37 PM   #940
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Quote:
Originally Posted by VT67 View Post
This is how far I've got with both boards, still waiting for some parts.

Regards
Nice soldering skills!

Good work
Do
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