hello dear co-enthusiasists!,
this is my first post so i hope i do it right...i recently finished this diy preamp based on a marantz older model...i have 2 questions...
1)if you know any improvements for more bass and highs and less midrange
2)it does not have a sub out...can i somehow obatain one exit??
the sound right now is precise and flat but doesnt have this "somethimg"
thank you very much!
ps:i hope i didnt confused the threadshttps://www.dropbox.com/s/ibqev1ynhkdbiof/DSC_0186.JPG?dl=0
https://www.dropbox.com/s/1j2pu84a3meg55h/DSC_0187.JPG?dl=0
https://www.dropbox.com/s/pzighhdvitfm4bh/DSC_0188.JPG?dl=0
https://www.dropbox.com/s/lib95t8ptmt5y4u/DSC_0190.JPG?dl=0
https://www.dropbox.com/s/79ii7jm5asysij8/DSC_0193.JPG?dl=0
https://www.dropbox.com/s/rx9annzn89oocqg/DSC_0194.JPG?dl=0
this is my first post so i hope i do it right...i recently finished this diy preamp based on a marantz older model...i have 2 questions...
1)if you know any improvements for more bass and highs and less midrange
2)it does not have a sub out...can i somehow obatain one exit??
the sound right now is precise and flat but doesnt have this "somethimg"
thank you very much!
ps:i hope i didnt confused the threadshttps://www.dropbox.com/s/ibqev1ynhkdbiof/DSC_0186.JPG?dl=0
https://www.dropbox.com/s/1j2pu84a3meg55h/DSC_0187.JPG?dl=0
https://www.dropbox.com/s/pzighhdvitfm4bh/DSC_0188.JPG?dl=0
https://www.dropbox.com/s/lib95t8ptmt5y4u/DSC_0190.JPG?dl=0
https://www.dropbox.com/s/79ii7jm5asysij8/DSC_0193.JPG?dl=0
https://www.dropbox.com/s/rx9annzn89oocqg/DSC_0194.JPG?dl=0
First thing to do is lose the cheap carbon volume control and replace with Alps Blue Velvet conductive plastic type pot of same resistance value.
You may need drill new holes and run jumper wires.
Carbon pots add ''excess'' noise....a masking noise that rides with the signal.
This noise will diminish apparent lows and add junk in the highs, likely giving the subjective mids suck out that you mention.
Expect to pay $25.00 or so delivered.
You may also benefit by fitting bipolar type electrolytic coupling caps.
Dan.
You may need drill new holes and run jumper wires.
Carbon pots add ''excess'' noise....a masking noise that rides with the signal.
This noise will diminish apparent lows and add junk in the highs, likely giving the subjective mids suck out that you mention.
Expect to pay $25.00 or so delivered.
You may also benefit by fitting bipolar type electrolytic coupling caps.
Dan.
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thank you all first of all,
Dan i can directly put the blue Alps the holes are allready done!
so you advise me to replace the wima's with polycarbonate pots?the wima's are 1μf 63v...should i also change capacitance?the preamp runs maximum at 24v.
Dan i can directly put the blue Alps the holes are allready done!
so you advise me to replace the wima's with polycarbonate pots?the wima's are 1μf 63v...should i also change capacitance?the preamp runs maximum at 24v.
Alps pot will likely fit your pcb, but no guarantee 😉.
Do you have schematic that you can post ?.
If so, we can help you with component choices.
Dan.
I found this schematic, is this what you have ?.
On closer inspection, your pcb has provision for the Alps volume control...in fact Marz kits are available including Alps Blue Velvet.
Dan.
yes sir u are a genius!thank you very much for all the trouble!
today i swapped to blue pot and i saw a slightly better results!i also replaces the stock 1μF63v with wima's of the same value...also i swapped to gold plated rca's...any other recommedations?
the preamp is really flat and accurate for the money and with a good power supply it can do wonders!thank you again,
Tasos
today i swapped to blue pot and i saw a slightly better results!i also replaces the stock 1μF63v with wima's of the same value...also i swapped to gold plated rca's...any other recommedations?
the preamp is really flat and accurate for the money and with a good power supply it can do wonders!thank you again,
Tasos
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