Phonic mixer preamp mods.

joaoveludo · 6th March 2009, 12:48 AM

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!

joaoveludo · 6th March 2009, 03:43 AM

pneaveill · 2nd April 2009, 10:31 PM

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.

joaoveludo · 1st May 2009, 08:41 PM

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?

6th March 2009, 12:48 AM	#1
joaoveludo diyAudio Member Join Date: Mar 2009	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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6th March 2009, 03:43 AM	#2
joaoveludo diyAudio Member Join Date: Mar 2009

2nd April 2009, 10:31 PM	#3
pneaveill diyAudio Member Join Date: Apr 2009	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.

1st May 2009, 08:41 PM	#4
joaoveludo diyAudio Member Join Date: Mar 2009	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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