Thank you nash. I made up some XLR connectors as jumpers for the inputs. I'm too cheap to buy a single "U" shaped jumper for $8. Can get 5 male XLRs for $8. I won't lose them as easily.
I haven't had the urge to mess with P3. Maybe in the future.
I haven't had the urge to mess with P3. Maybe in the future.
Thank you 6L6. How much current do you think they need? I want to build it as a Preamp.
It will be my second attempt at a MOSFET type Preamp. The first one years ago was that two transistor balanced one. Which I was a bit disappointed in. I put that down to the input capacitance that reduced HF detail.
Unless you can recommend something else that you think might be better?
It will be my second attempt at a MOSFET type Preamp. The first one years ago was that two transistor balanced one. Which I was a bit disappointed in. I put that down to the input capacitance that reduced HF detail.
Unless you can recommend something else that you think might be better?
Thanks for that. Just one last thing.
When I have built preamps using a 2SK170, I found the HF's were lacking due to the input capacitance.
Have you found this is the case with this?
When I have built preamps using a 2SK170, I found the HF's were lacking due to the input capacitance.
Have you found this is the case with this?
Could someone kindly post a diagram showing XLR pin connection for BBA3 I'm balanced mode? Thanks in advance.
I compared the BBA3 circuit with that of BA3 (please see below BBA3 Left, BA 3 Right). I cant find any difference
. So what am I missing?
You are missing half of the balanced circuit:
https://www.diyaudio.com/community/threads/burning-amp-ba-3b-balanced.201281/
https://www.diyaudio.com/community/threads/burning-amp-ba-3b-balanced.201281/
Attachments
Please note that the BA3 board at the Diyaudio store (which is the layout in Papa's BA3 article) ( https://diyaudiostore.com/products/ba3-burning-preamplifier ) is for two single-ended channels and one can readily adapt a single board for a balanced channel. So you only need two store boards for two balanced channels.
I can't think of any other BA3 pcbs off hand so you may have to look around...
Have fun.
I can't think of any other BA3 pcbs off hand so you may have to look around...
Have fun.
I did one some years ago. It worked, but I never made it to a finished amplifier so no further experience to share though. Feel free to try it or to use my project files as basis for another layout 🙂
https://theslowdiyer.wordpress.com/2018/11/11/experimenting-with-the-bba3fe/
https://theslowdiyer.wordpress.com/2019/05/06/project-files-the-bba3fe/
https://theslowdiyer.wordpress.com/2018/11/11/experimenting-with-the-bba3fe/
https://theslowdiyer.wordpress.com/2019/05/06/project-files-the-bba3fe/
My mistake. Dennis is correct. The BA-3 preamp board at the diyAudio store (https://diyaudiostore.com/products/ba3-burning-preamplifier) is a stereo board so only two boards are required for the balanced preamp.
If the board is one channel only, which is what I had assumed since a saw a non-diyAudio version of the board when I did a search, then four boards are required for the balanced preamp.
If the board is one channel only, which is what I had assumed since a saw a non-diyAudio version of the board when I did a search, then four boards are required for the balanced preamp.
Thanks for some great advise (love this forum). I also read up and understand 'balanced' better now. On the sound signature of the preamp, I found this a bit 'tubey' - adds a lot of body to the music but chooses where to add it! How would others describe the music experience with this pre? Thanks in advance.