nedonnelly
Member
- Joined
- Jun 28, 2017
- Messages
- 18
Hello all electron wizards!
I am planning on converting an Akai Reel to Reel Tape Machine M8 into 2 mic pres, and I wanted to start with some questions regarding features that I would like to have coming out of this build.
To start, here is the original M-7 Schematic:
View attachment M7-alt-LandR-cleaned-up-from-service-manual.png
Unfortunately I don't have any pictures of the actual unit as I am waiting on it to arrive, but I'm trying to get a jump on the project by asking some questions here.
Now on to the features that I would like to have.
1) +48v switch
2) Phase and pad switch
3) Balanced and unbalanced input
4) Balanced and unbalanced output
I've been watching a bunch of videos from Kyle Reid amplification to try to understand the possibilities of these R2R units. Here he is walking through the features:
From that video it seems the phase, pad switch, and unbalanced/balanced input are easily doable. However, it doesn't look like he has a balanced output anywhere on the preamp. I also don't see a phantom power anywhere.
So my questions are:
1. How manageable would it be to have both an XLR output and 1/4 in. output with this circuit?
2. Could phantom power be reasonably inserted into this circuit?
For what it's worth, it looks like TRC electronics makes a nice plug and play phantom power: https://trcelectronics.com/products/mean-well-rs-25-48.
Also, I see that someone at world pro audio chose to have a balanced output, but I'm unsure if there is also an unbalanced output. https://www.worldproaudio.com/WPA-Akai-M7-mod
Thanks for the help!
I am planning on converting an Akai Reel to Reel Tape Machine M8 into 2 mic pres, and I wanted to start with some questions regarding features that I would like to have coming out of this build.
To start, here is the original M-7 Schematic:
View attachment M7-alt-LandR-cleaned-up-from-service-manual.png
Unfortunately I don't have any pictures of the actual unit as I am waiting on it to arrive, but I'm trying to get a jump on the project by asking some questions here.
Now on to the features that I would like to have.
1) +48v switch
2) Phase and pad switch
3) Balanced and unbalanced input
4) Balanced and unbalanced output
I've been watching a bunch of videos from Kyle Reid amplification to try to understand the possibilities of these R2R units. Here he is walking through the features:
From that video it seems the phase, pad switch, and unbalanced/balanced input are easily doable. However, it doesn't look like he has a balanced output anywhere on the preamp. I also don't see a phantom power anywhere.
So my questions are:
1. How manageable would it be to have both an XLR output and 1/4 in. output with this circuit?
2. Could phantom power be reasonably inserted into this circuit?
For what it's worth, it looks like TRC electronics makes a nice plug and play phantom power: https://trcelectronics.com/products/mean-well-rs-25-48.
Also, I see that someone at world pro audio chose to have a balanced output, but I'm unsure if there is also an unbalanced output. https://www.worldproaudio.com/WPA-Akai-M7-mod
Thanks for the help!