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Hi, Whilst comparing the 2 different channels, Ive realised that there are different resistors elswhere These are the ones in the pics with red rings around them http://i390.photobucket.com/albums/oo345/paulrichards7/Red-n-green.jpg http://i390.photobucket.com/albums/oo345/paulrichards7/resistor-sch...

hey andy
thanks for that
paul

hi themagicmanmdt,
thanks for that
paul

Just out of curiosity, what sets the high frequency roll off
thanks
paul

From what i understand, its best to keep legs as short as possible
Otherwise there is more resistance, i think?
the others will clarify this though
paul

Here is a High pass corner frequency calculator
http://www.opamplabs.com/rfc.htm
Paul

sorry the scum My current hunch is that when the strips were revised, resistor values in the preamp were swizzled to drop the noise...or that the added metal film resistors really are important. i have gathered and tried so much info that i have overlooked your recommendation sorry for not seeming g...

Thanks for that Jim
Could you elaborate a liitle bit more on the math of
Use the standard 2xpi/rc formulas to determine the -3 db roll-off points.
Thanks
Paul

To shorten the audio path and reduce noise
paul

So I came across these words of wisdom for Jim Williams: Another problem with leaving in older caps is for one they are usually too small in value. Designers typically use the smallest and cheapest parts they can so low end roll off are set to 20 hz or so. That will create phase shift beginning at 2...

Hi
I never use the insert or direct outs on my board so i just want to bypass those circuits
Is there anything I need to be aware of or tips for bypassing the elctronics
Here is the schematic
http://i390.photobucket.com/albums/oo34 ... noline.jpg
Thanks
Paul

thanks guys
paul

So Im gonna recap my PSU http://i390.photobucket.com/albums/oo345/paulrichards7/PSU-1.jpg Should I double the size of caps, but keep the same voltage? Ive heard that PSU caps are severely underated What about those green chicklet caps? http://i390.photobucket.com/albums/oo345/paulrichards7/PSU.jpg I...

I have replaced all ICs, transistors, diodes and resoldered all connections
Still noise?
Paul

Hi, the latest
Ive replaced all TL072, All transitors and the diodes
Re-soldered every connection
And guess what?
Still noise
Anymore ideas
Thanks so much for all your help
Paul