dogwan
Dogwan
A while back I picked up an AD-1702 crossover with the intent of going to stand mounts and dual subwoofers in my living room system. Bought the unit off of E-bay out of Hawaii. Got a good deal because the case had visible corrosion and there were very few bidders. When it showed up I was relieved that the insides were very clean. Because of the external corrosion I wasted no time in installing better RCA jacks. While I was at it I installed an IEC inlet with a ground lift switch (ground to chassis), and removed the summed mono out (looked like a weird implementation).
When I started putting the system together all functions worked and it was dead quiet. But, I could not get it to integrate properly. I had read on the Rockwell page that some people scale the crossover points on these. I had noticed that none of the caps looked like the originals.
Well, life happened and I abandoned the project before I could investigate further.
Flash forward and I am cleaning out the stash and pulled out the AD-1702 and cracked her open again. Here are pics. It looks like all the film caps are scaled at 10% in both the high-pass and low-pass sections. I.e., every 0.22uf labeled (on the board) film cap has a 0.022 cap. Can't believe I didn't catch this when I 1st got it.
Also all the electro's are bypassed with 0.56uf TRW film caps.
Also noticed some of the 1% resistors look like they have been replaced.
Did these come with Op-amp sockets installed?
Someone has obviously been inside before me. My question is why? What would be the point of scaling both hi and low pass cutoff points to 10%? Or, did someone think they were upgrading the caps and not understand capacitor designations?
I do want to hang on to this piece as someday I might follow through with the original plan. Or, at least it will be a handy component to have if I ever do distributed bass. Now it looks like I will be investing more time and money into getting it resolved.
Mostly just looking for input and direction.
When I started putting the system together all functions worked and it was dead quiet. But, I could not get it to integrate properly. I had read on the Rockwell page that some people scale the crossover points on these. I had noticed that none of the caps looked like the originals.
Well, life happened and I abandoned the project before I could investigate further.
Flash forward and I am cleaning out the stash and pulled out the AD-1702 and cracked her open again. Here are pics. It looks like all the film caps are scaled at 10% in both the high-pass and low-pass sections. I.e., every 0.22uf labeled (on the board) film cap has a 0.022 cap. Can't believe I didn't catch this when I 1st got it.
Also all the electro's are bypassed with 0.56uf TRW film caps.
Also noticed some of the 1% resistors look like they have been replaced.
Did these come with Op-amp sockets installed?
Someone has obviously been inside before me. My question is why? What would be the point of scaling both hi and low pass cutoff points to 10%? Or, did someone think they were upgrading the caps and not understand capacitor designations?
I do want to hang on to this piece as someday I might follow through with the original plan. Or, at least it will be a handy component to have if I ever do distributed bass. Now it looks like I will be investing more time and money into getting it resolved.
Mostly just looking for input and direction.
