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I wish you all the best with the moving and renovation! I have done a few (quick) mixes with this new to me hybrid workflow (the Telefunken Live from the Lab sessions are great!).It's great to work with a physical desk. There is still tons of work left like building a patchbay, a siderack and...

Hi all together, it has been quite a while since my last post, but i have to tell some great news: Besides one stereo and one master channel, that remain unchanged for a few more weeks as reference, i have finally finished the process.:guitar: almost 3,5 thousand electrolytic caps, an other 3,5...

Hi, I finally got started with the mono/mic channels. I treated the unencapsulated poti with DeosIT D5 to solve the dirt and DeoxIT F5 after that which contains some amount of lube. It moves smoothly and i can not hear any scratching noise etc. Greetings Michael

Sad to hear your transformer is broken. Yesterday I did some THD measurements. With that I checked the calibration instructions to calibrate the vca for minimum distortions. Its kind of tricky and sensible, but with some patience the results are quite pleasing. If you want I can post the...

grab some caps, rebuilt the test circuit you posted before and measure it up, if you don't believe it... some colleague made this kind of tests, but i'm sorry, i dont have the plots here. For new designs, sure, built a dc coupled design, and get rid of all electrolytics possible, is for sure...

The curve is getting steeper, but its not linear until voltage xy, it is only getting even more non linear at higher voltages. This is the same effect for ac signals because the characteristic curve does not care if there is a given dc voltage or if that voltage is a momentary value in an ac...

The TDK document is very general on capacitor properties. In figure 4 is drawn the nonlinear relation between voltage and current "The oxide layer constitutes a non-linear voltage-dependent resistance that causes the DC current to increase more steeply as the voltage increases. A characteristic...

You are right, the distortions reduce with the capacity. This same experiment with a fixed value capacity with increasing voltage ratings will lead to similar results. You are right, this are only 0.002% but there is not only one cap in the signal flow. There are tons of it, and at every stage...

Yes, it is fully functional, but this desk was selled fully untested, so there were concerns, that it could be not working. Thanks for the hint! Adding a DC voltage high enough, that no part of the signal can go into negative, so that the cap is never reverse poled. These effects are complex...

I think we are talking about different effects. I was talking about nonlinear effects producing distortions (adding unwanted frequency content, not beeing present in the original signal) tht happen if a polarized electrolytic capacitor is driven in reverse. I did not talk about any low pass...

In this point I have to disagree. As far as I understand the problematic is, that since the coupling caps are not dc-biased, the get are driven against there polarisation, which causes nonlinearities. Higher voltage ratings lead to thicker oxide layers, lead to less currents if revers poled...

I don't take your answers as offense. So there everything is fine:) I agree your approach in general, but I think my constaints are a bit different to yours. I did not buy this desk because I needed it, or because i would absolutely start to mix with it in the shortest time possible. I bought...

The cap between signal input +/- or power +/- ? I will thest your recommodations and if the difference is "huge enough" i will implement it, even if it leads to even more work:D

Thank you for your critical hints. I only swapped the heavily used MC33078 and TL072. The replacement recommendations were from an experienced engineer who worls for a small company who design some parts for RME as their flagship M32pro, so I trust the recommondations. Second I the offset...

It looks like you made a really good deal on those meters! I have to recap one more stereo channel before I can move on with the monitoring section (For A/B comparison i leave chanel 40 with old caps and channel 39 with only new electrolytics without foils). yesterday I recapped channel 32 and...

Hi, i think i figured it out. all the master section meters are connected seperately to a "riser board", where wired go to the mainboard. i think it are the blu/white twisted cables with label 31 and 32 that correspond to the l / r monitor meter

I need to check this out on monday

Hope this is what you were asking for. it was a 1kHz square wave. I have not made distortion or noise analysis so far, but i think i will next week

They monitor the Control Room bus, the gain reduction meter seems to have no function. I the meantime I have made some quick measurements. The Master A is equipped with new caps + foil bypass. Channel 40 is original state. Testsignal 1 kHz square wave. Channel 35 is equipped with new caps +...

Good luck with finding the error! I will recap master A this evening :cool: