First of all, I want to thank Sachin and Omishra for all of their help via this forum/thread and their countless emails. My hat off to you guys, THANK YOU.
Well, I was reviewing various email threads between OM and me and I found out the reason he suggested that I should use a different set of Inductors and Electrolytic Capacitors so that I could run all of the boards from the same PSU. So, I did, and connected the Switch Selector and LDR to the +15VDC side of the PSU. The PASS B1 is connected to the 24VDC and the CNC and SSP both to the -15VDC | 0 | +15VDC. I also used the LED port provided on the PASS B1 for the "Power LED" just above the ON/OFF switch and use an amber LED. On the SSP and CNC I am using the 2134 OPAmp.
I haven't try the turntable yet. :nono:
Sound??? Well I can tell that the Highs are very subtle and more define as well as the Mid's and Low's. No distortion, no noise, just a pleasure to listen to my system. I must say this, the Marantz 2252B was completely recap. That definately made a big difference in sound. A replaced every elect cap from all of the boards. Fixed the FM Stereo as well. As you can see from my pictures I have a set of Bose 901 Series III and I replaced all of the drivers with new ones and recap the Bose Active EQ. I also have an MXR EQ and that too replaced the two caps and the voltage regulators and cleaned the sliders. I am also using a Behringer Sonic Exciter SX-3040 to enhance and dominate the Low's and High's.
My idea is to move the Switch Selector LED's and install them on the Front Plate of the aluminum box but that will be another project. Meanwhile, here are some more pictures of the final project. :yes:
First of all, I want to thank Sachin and Omishra for all of their help via this forum/thread and their countless emails. My hat off to you guys, THANK YOU.
Well, I was reviewing various email threads between OM and me and I found out the reason he suggested that I should use a different set of Inductors and Electrolytic Capacitors so that I could run all of the boards from the same PSU. So, I did, and connected the Switch Selector and LDR to the +15VDC side of the PSU. The PASS B1 is connected to the 24VDC and the CNC and SSP both to the -15VDC | 0 | +15VDC. I also used the LED port provided on the PASS B1 for the "Power LED" just above the ON/OFF switch and use an amber LED. On the SSP and CNC I am using the 2134 OPAmp.
I haven't try the turntable yet. :nono:
Sound??? Well I can tell that the Highs are very subtle and more define as well as the Mid's and Low's. No distortion, no noise, just a pleasure to listen to my system. I must say this, the Marantz 2252B was completely recap. That definately made a big difference in sound. A replaced every elect cap from all of the boards. Fixed the FM Stereo as well. As you can see from my pictures I have a set of Bose 901 Series III and I replaced all of the drivers with new ones and recap the Bose Active EQ. I also have an MXR EQ and that too replaced the two caps and the voltage regulators and cleaned the sliders. I am also using a Behringer Sonic Exciter SX-3040 to enhance and dominate the Low's and High's.
My idea is to move the Switch Selector LED's and install them on the Front Plate of the aluminum box but that will be another project. Meanwhile, here are some more pictures of the final project. :yes:
Regards, Felix aka catman.
Well, I went through the tech sheets of all the opamps and was definitely an interesting read. It seems LME49990 is the king for having the lowest harmonic distortion. The LME49720 comes in second in the THD profile. However, LME49720 seems to be designed for the phono stage application to comply RIAA, hence the data is provided with deviation value of ~0.3% around 100Hz and pretty much on the dot from 500Hz and above. At least from the spec sheets, I have my vote on pair of LME49720 or combo with LME49990 to gain musical details. I will have to take it to the listening audition with bunch of opamps in my hands, once my project completes.
