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(Click for really big pics)
There didn't seem to be much interest in this when I raised the idea on another thread but I thought I would post my holiday DIY anyway. I started out simply putting the class A output stage in place of one on my version of Jakob's G1176 board but quickly decided to do a whole new layout, incorporating the discrete meter circuit of the earlier revisions as well (and all the earlier component designations).
I did a double-sided home etch, fixed a few minor errors and have it up and running into some CJ iron (through a capacitor to block the DC). Everything seems to work just fine. Just waiting on output transformers from Andrew at Purple so I can hook up the feedback and DC balance windings, but I don't anticipate any problems as the amplifier seems to be working well even without the transformer feedback.
I'll post some PDFs of the corrected layout if anyone is interested. Sorry, I tried to make it single-sided but it was just too hard for me. Anyway, the ground plane makes it nice and quiet, even outside of a case.
*edit: Some documentation including self-etch files can be found on my site.
Please download the 1176LN manual from the JBL Pro Site.
![](https://proxy.imagearchive.com/10d/10d1e37970b23fe8a431c40591a4337a.jpg)
(Click for really big pics)
There didn't seem to be much interest in this when I raised the idea on another thread but I thought I would post my holiday DIY anyway. I started out simply putting the class A output stage in place of one on my version of Jakob's G1176 board but quickly decided to do a whole new layout, incorporating the discrete meter circuit of the earlier revisions as well (and all the earlier component designations).
![](https://proxy.imagearchive.com/101/10179ae1d555a38311e3914a462cea62.jpg)
I did a double-sided home etch, fixed a few minor errors and have it up and running into some CJ iron (through a capacitor to block the DC). Everything seems to work just fine. Just waiting on output transformers from Andrew at Purple so I can hook up the feedback and DC balance windings, but I don't anticipate any problems as the amplifier seems to be working well even without the transformer feedback.
I'll post some PDFs of the corrected layout if anyone is interested. Sorry, I tried to make it single-sided but it was just too hard for me. Anyway, the ground plane makes it nice and quiet, even outside of a case.
*edit: Some documentation including self-etch files can be found on my site.
Please download the 1176LN manual from the JBL Pro Site.