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Old 6th March 2009, 12:48 AM   #1
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Default Phonic mixer preamp mods.

Hi!

First time poster! Love this forum!

Here is the schematic for the preamp section of my Phonic MR1843x mixer.

[IMG] http://img404.imageshack.us/img404/416/preamp.jpg[/IMG]
http://img404.imageshack.us/img404/416/preamp.jpg

Can somebody tell me what are the obvious (if any) procedures to improve the sound of the mixer preamp? I only use the preamp section as i use the insert jack as direct out to a Terratec Ews88 mt. The opamps are smd mounted and i don't have the right tools to work with smd components so i was just interested in resistor, transistor ou capacitor swapping or adding/removing.

Thanks everyone!
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Old 6th March 2009, 03:43 AM   #2
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Click the image to open in full size.
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Old 2nd April 2009, 10:31 PM   #3
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also first time poster (just joined).

Am quite curious with this one also, as this post and another got my attention enough to join the forum here.
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Old 1st May 2009, 08:41 PM   #4
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Already changed c102 and c101 with 47uf/63v (100uf did not fit in the space), bypassed c104 and c105 with shunts (to remove them from the signal path) and changed c116 to 1000uf/16v. I can already hear improvement.

Im with the mixer open just for one mor day! I will need it done by tomorrow. Any last ideas?

Any ceramic cap that i can remove to open the frequency response?
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