DaxLiniere
Well-known member
Hey everyone!
I've finished off my dual Green pre!
(which I have cheekily marked as 909B :grin: )
First of all, I'd like to thank EVERYONE here at the P-P forum who has helped me out on this project (either directly or otherwise).
Large view: http://www.puzzlefactory.com.au/Green_inside.jpg
Face: http://www.puzzlefactory.com.au/face_sample.gif
I gotta say, this baby sounds great!
I'll put up a few samples of this preamp, recorded with a Sony C-800g in comparison with my console pres (Chilton CM2) and my Summit 2BA-221.
The samples will also include comparisons of 3 different signal path capacitors and 2 different PSUs. (One using fixed 7*15 regs and the other using the recommended LM3*7 adjustable regs.)
Notes:
1) The 1/4" socket on the front panel is the output, not a DI input. My patchbay is 1/4" so there was no point in fitting an XLR then having to make adaptor leads.
2) Yep, that's right - no phase switch. I find that I basically never need to invert phase when I'm recording and it's just another set of contacts (i.e. more noise) that I was able to avoid.
3) Klotz AEY-122 used for all signal path connections, inc gain. The light green wires connect from the braid shield to a ground point on the PCB. Gain and HPF are grounded on one end only.
4) The PSU has a sheet of tin dividing it from the rest of the preamp. The sheet is grounded to mains earth. (top right green wire)
Things left to do:
Change the HPF pre/post switches to DPDT and parallel the poles (to lower resistance & hence noise).
Lower the HPF cutoff frequency from 100Hz to 70Hz. (Just a personal preference)
Get someone to CnC rout the face plate and mount the metering LEDs.
I've finished off my dual Green pre!
(which I have cheekily marked as 909B :grin: )
First of all, I'd like to thank EVERYONE here at the P-P forum who has helped me out on this project (either directly or otherwise).
Large view: http://www.puzzlefactory.com.au/Green_inside.jpg
Face: http://www.puzzlefactory.com.au/face_sample.gif
I gotta say, this baby sounds great!
I'll put up a few samples of this preamp, recorded with a Sony C-800g in comparison with my console pres (Chilton CM2) and my Summit 2BA-221.
The samples will also include comparisons of 3 different signal path capacitors and 2 different PSUs. (One using fixed 7*15 regs and the other using the recommended LM3*7 adjustable regs.)
Notes:
1) The 1/4" socket on the front panel is the output, not a DI input. My patchbay is 1/4" so there was no point in fitting an XLR then having to make adaptor leads.
2) Yep, that's right - no phase switch. I find that I basically never need to invert phase when I'm recording and it's just another set of contacts (i.e. more noise) that I was able to avoid.
3) Klotz AEY-122 used for all signal path connections, inc gain. The light green wires connect from the braid shield to a ground point on the PCB. Gain and HPF are grounded on one end only.
4) The PSU has a sheet of tin dividing it from the rest of the preamp. The sheet is grounded to mains earth. (top right green wire)
Things left to do:
Change the HPF pre/post switches to DPDT and parallel the poles (to lower resistance & hence noise).
Lower the HPF cutoff frequency from 100Hz to 70Hz. (Just a personal preference)
Get someone to CnC rout the face plate and mount the metering LEDs.