« Reply #1 on: April 08, 2006, 03:12:18 AM »
I would like to DIY the UA5 oade or similar pre-amp mods. Would be better if the TRS inputs on the Neutriks were left available - but not a necessity. Does anybody have instructions for these mods please?
It is not the OADE mod, but it improves the sound:
http://www.cs.uwaterloo.ca/~mannr/UA5/ua5_poorlymodded.jpg/begin{geek speak}
- digimod (described elsewhere)
- replace four i4580 chips with AD8620 or AD712. (I used AD712 for the mic pres, AD8620 for the ADC drivers).
- replace eight 1uF/50V aluminum caps with four 0.47uF poly caps. (Note: you replace two series 1uF caps with a single 0.5uF cap, which is equal, but you disable the TRS inputs in the process.)
- replace two 22uF aluminum caps near ADC with higher quality electrolytic bypassed with 0.1uF poly or film cap
/end{geek speak}
You should be able to follow those steps on the (big!) image I've linked to.
Richard
« Last Edit: April 08, 2006, 03:14:28 AM by poorlyconditioned »
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Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
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Topic: UA5 pre amp mod instructions (Read 15851 times)