I just bought a custom console and I'm trying to figure out what type of pres these are, if they're a decent design, worth keeping, or if I should consider replacing them.
Here's a schematic I've created. It's not pretty, but I've checked it many times for accuracy:
https://drive.google.com/file/d/0BxiPOzSDUqGKLUp4ejlxWUNfUlU/view?usp=sharing
The audio is being fed from 150:600 or 600:600 Peerless transformers via a switch that selects between MIC, -15dB and LINE. Not sure which is the audio in and which is out.
Watcha think? Should I keep em or dump em? I'm thinking I could replace em with EZ1290's and keep the 150:600 xformers.
PS: I've edited the original subject and post to more clearly differentiate between multiple posts on this console and these preamp cards. I've also removed the pics of the PCB and replaced it with an actual schematic. I'll sort out the PSU issues in other posts and leave the preamp circuitry/design to this one. Sorry if this has caused any confusion.
Here's a schematic I've created. It's not pretty, but I've checked it many times for accuracy:
https://drive.google.com/file/d/0BxiPOzSDUqGKLUp4ejlxWUNfUlU/view?usp=sharing
The audio is being fed from 150:600 or 600:600 Peerless transformers via a switch that selects between MIC, -15dB and LINE. Not sure which is the audio in and which is out.
Watcha think? Should I keep em or dump em? I'm thinking I could replace em with EZ1290's and keep the 150:600 xformers.
PS: I've edited the original subject and post to more clearly differentiate between multiple posts on this console and these preamp cards. I've also removed the pics of the PCB and replaced it with an actual schematic. I'll sort out the PSU issues in other posts and leave the preamp circuitry/design to this one. Sorry if this has caused any confusion.