This DIY disease is progressing... ;D
It started with a pair of SCA N72's, then moved onto cloning an internal gain boost/preamp for guitar (including etching my own PCB), then most recently a RevD 1176.
My next conquest is an old Lee Jackson guitar preamp that has been out of production since 1988. I have searched far and wide, and unfortunately, I can't find the schematic anywhere. Now, I have no problem copying the layout exactly, etching my own board, and stuffing it with my original as a reference like a chimpanzee with no knowledge of electronics. But I'm sure that most of these components have become obsolete over the past 20 years.
There are a few components in particular that are stumping me. The main one is the blue thing on the lower left (ALCO HG2C-6S); it's just behind the DPDT push/pull pot for distortion. I have no idea what it is, or if any equivalent exists today. Nothing comes up in searches, so this may have become obsolete long before the days of the internet.
Also, there is a gold-colored component near the upper left of the board, which is what I believe to be a capacitor. I've never seen any like that, so hopefully someone can tell me what the composition is. The value and brand may be marked on the underside, so I may have to remove it to find that out.
http://dl.dropbox.com/u/324863/GP1000.JPG
Everything else is fairly straightforward and wouldn't pose too much of a challenge, at least it would seem that way considering how simple the design is. I guess a project like this would serve to satisfy my curiosity and get me some experience in reverse-engineering and schematic drawing. Design is still way out of my league though...
Many thanks to anyone who can help out.
It started with a pair of SCA N72's, then moved onto cloning an internal gain boost/preamp for guitar (including etching my own PCB), then most recently a RevD 1176.
My next conquest is an old Lee Jackson guitar preamp that has been out of production since 1988. I have searched far and wide, and unfortunately, I can't find the schematic anywhere. Now, I have no problem copying the layout exactly, etching my own board, and stuffing it with my original as a reference like a chimpanzee with no knowledge of electronics. But I'm sure that most of these components have become obsolete over the past 20 years.
There are a few components in particular that are stumping me. The main one is the blue thing on the lower left (ALCO HG2C-6S); it's just behind the DPDT push/pull pot for distortion. I have no idea what it is, or if any equivalent exists today. Nothing comes up in searches, so this may have become obsolete long before the days of the internet.
Also, there is a gold-colored component near the upper left of the board, which is what I believe to be a capacitor. I've never seen any like that, so hopefully someone can tell me what the composition is. The value and brand may be marked on the underside, so I may have to remove it to find that out.
http://dl.dropbox.com/u/324863/GP1000.JPG
Everything else is fairly straightforward and wouldn't pose too much of a challenge, at least it would seem that way considering how simple the design is. I guess a project like this would serve to satisfy my curiosity and get me some experience in reverse-engineering and schematic drawing. Design is still way out of my league though...
Many thanks to anyone who can help out.