Search found 88 matches
- Tue Jul 25, 2023 6:22 pm
- Forum: Test, Measurement and Repair
- Topic: Intermittent scratches/distortion/level changes in preamp
- Replies: 10
- Views: 23902
Re: Intermittent scratches/distortion/level changes in preamp
I can’t tell because I don’t recognize the exact brand of the button. My bet is they are silver.
- Tue Jul 25, 2023 4:49 pm
- Forum: Test, Measurement and Repair
- Topic: Intermittent scratches/distortion/level changes in preamp
- Replies: 10
- Views: 23902
Re: Intermittent scratches/distortion/level changes in preamp
I think I found the culprit. It's the buttons. Wayne, you were right. The manufacturer solution is very questionable. Basically, this is a single input preamp that is pretending to be able to take line levels. But in fact, what "Line in" button does is insertion of the 36dB pad. This is no...
- Wed Jul 19, 2023 8:33 am
- Forum: Test, Measurement and Repair
- Topic: Intermittent scratches/distortion/level changes in preamp
- Replies: 10
- Views: 23902
Re: Intermittent scratches/distortion/level changes in preamp
As expected, hair dryer did not make anything break. I've tried cleaning switches, but there's a ton of components and wires dangling on these buttons (at both sides!), so I didn't dare to unsolder it all and disassemble the buttons. I hope that all the chemistry I used managed to get inside the but...
- Tue Jul 18, 2023 7:27 am
- Forum: Test, Measurement and Repair
- Topic: Intermittent scratches/distortion/level changes in preamp
- Replies: 10
- Views: 23902
Re: Intermittent scratches/distortion/level changes in preamp
Tried the freezer. No dice. The next is a hair dryer. But I doubt it will show anything. Another suspects are the push buttons, which are a type of multipole (ala dialistat, but modern) thingies. I tried to make them produce the fault that I described and I sort of succeeded. Sort of, because it’s r...
- Sat Jul 15, 2023 11:34 am
- Forum: Test, Measurement and Repair
- Topic: Intermittent scratches/distortion/level changes in preamp
- Replies: 10
- Views: 23902
Re: Intermittent scratches/distortion/level changes in preamp
I don't have a lot of experience with freezer. Is it safe to use it on live circuit? Or should I power it down, apply freezer and then power up again?
- Wed Jul 12, 2023 7:18 am
- Forum: Test, Measurement and Repair
- Topic: Intermittent scratches/distortion/level changes in preamp
- Replies: 10
- Views: 23902
Intermittent scratches/distortion/level changes in preamp
I'm repairing the BAE preamp (that is a copy of Neve 1073 mic preamp section). It has very unpleasant and difficult to trace problem. Once in a while the sound becomes distorted and changes in level (although the change is not drastic, my estimate is 2-4dB), and after some short time everything gets...
- Wed Jul 12, 2023 7:02 am
- Forum: Pro Audio Design
- Topic: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 142
- Views: 399542
Re: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
I've been wanting to use the ZTX851 or ZTX1053 in a mic preamp. Both are exceptional. Me too! However, given current situation in our region, it's very difficult to get parts from the outside. And I do have a ton of 44xx that I can play with. I'll see, maybe I will provide additional footprint for ...
- Wed Jul 12, 2023 5:12 am
- Forum: Pro Audio Design
- Topic: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 142
- Views: 399542
Re: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
I’m thinking about this flying concept and applying it to some other preamp. I was planning to build Cohen type preamp at some point anyway. And this whole flying rails concept makes the project much more fun. I suppose that THAT chips are based on the same topology, so there should be no problem wi...
- Mon Jul 10, 2023 12:10 pm
- Forum: Pro Audio Design
- Topic: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 142
- Views: 399542
Re: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
This discussion has sparked a new wave of my interest. Might get to building the Wayne version at some point.
- Sun Jul 09, 2023 3:35 pm
- Forum: Pro Audio Design
- Topic: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 142
- Views: 399542
Re: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
I've just stumbled upon this:
https://audioxpress.com/news/acoustics- ... ugust-2022
Article by Michel Nieuwenhuizen looks a lot like Waynes work.
https://audioxpress.com/news/acoustics- ... ugust-2022
Article by Michel Nieuwenhuizen looks a lot like Waynes work.