Aw shit! What have I done here....
Looks like I've gone down the deep rabbit hole of repair and amp modding on my friend's MM...
Images:
Thu, 04/16/2020 - 16:09
#1
G60syncro
RD one hundred getting it's brains cloned
RD100 CAD schematic
The image is blurry...but that looks like a nice clean representation of the schematic. Is it downloadable?
Indeed, it's just a copy of
Indeed, it's just a copy of the GD-2 board from my friend's RD100... The original .gif file was a bit hard to read and also I wanted to have it linked to my PCB layout in KiCAD to make sure I had everything wired up properly. Basically, my friend's amp is fried and I'm cloning the PCB to make it run like new again!!
Finished schematic...
There, I think this looks alright... You guys let me know what you think! There might be some annotations to clean up here and there, but it's already way more legible that the scan of the original one!!
Cloned RD100
Well... looks good... let's see how it sounds!!
It's alive!!
Okay, I know it's been slow here... After I posted the picture of the assembled board I got into a garage building project and moved all the stuff from my old place into it! Then I ran into the issue of not being able to buy the breakers needed for the workshop which caused further delay... Anyhoo, I'm back and happy to report this thing is back to being sweet sounding!!
With the new workshop setup, I was able to get some shit done and first on the order was getting the Musicman box out of storage and running some unpowered signal tests on the board itself. First off I was having a trouble with this not having any gain when powered... It was traced to an opamp having one side of it's pins wedged between a cap an the socket rather that in the socket proper. Once resolved, I powered up the amp once more and then it was alive!! Virtually no hum and that's with a Tele plugged into it without the chassis properly shielded and the filter cap doghouse off. I can't wait to get it back to my friend this week for a proper test and hopefully a sound clip!!
Also, I need to fix an error on the schematic... where the shielded cable connects to the impedence switch, it's on the wrong pin on my copy of the schematic.