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Currently I am using leaded w/ water soluble flux (Kester 331 63/37).

I use Eagle because that's the program I learned on. I think KiCAD might be the way to go for new users to CAD software. With Autodesk, one never knows how long they will keep a piece of software going. As for your side question: Hand drawn schematics are fine so long as it is legible. There's...

I have an alternative: copy the library part, remove the left pad and simply make a half circle cut on the dimension layer. You can still fold the tab over the PCB to secure it and no expensive uncharge is required.

Hmm, I actually have never tried this with Eagle. But, I know who would have the answer: Kevin over at Aion. Also, this: https://forums.autodesk.com/t5/eagle-forum/board-with-castellated-edges/td-p/8923086

I think there's a much simpler solution here. You shouldn't need to buffer your tuner output in most cases, unless it's a really so super old or cheapy one that loads down its input. Most modern tuners have true bypass and likely a high input impedance when on. This means you should be able to...

True bypass means your signal passes from guitar input to output with no connection to the circuit. What you've drawn above is not true bypass because the input is always connected to the circuit input. Only the output is being switched. Also, the circuit is always powered, regardless of the...

Also, the new one is 16mm pots with top jacks. So, that's nice.

I had another batch of boards in hand and ready to go (updated layout) when I realized I left a trace off the PCB. So, I just need to order the revised ones.

Good to know. So, the Donner does not have isolated outputs, I reckon?

It's not gibberish. IMO, there's no reason not to attach every ground point to a pour in both the top and bottom layers (for analog guitar circuits). The only time I don't do this is either I'm using a 4 layer design (meaning only one inner layer has a ground pour) or I'm dealing with a compact...

I solved it!!

A long time ago I had a custom rubber stamp made for a single pass imprint on a 1590B (for a Big Muff project). It wasn't perfect, but really easy to do.

Glad you like it! Is that Stazon ink stamping?

Next up is to get the garage cleaned out so I can start making the work tables. We kinda junked it up in Dec. to get the house ready for all our holiday guests. Only used like $50 of the Lowes gift cards so far! They are burning a hole in my pocket.

I have a pretty decent design worked out for this specifically for bass. Just haven't followed through yet. I'm sure Robert's fits the bill, too.

Yeah, I have some NPN and PNP from CEDist. I've got three builds I'm working on that will use them but I need to test them for gain and leakage first.

Isn't that a 1790? My eyes have convinced me.

Got yourself a custom regulator there. 68v in, voltage divider to provide ~40v to the transistor base, then ~38v out.

Didn't see that. Well, IMO there's nothing wrong in copying a layout as a means to simply learn how to do it. But, you are absolutely right: the files shouldn't be made public in this case (this is why I should read all replies before vomiting out my opinion).

It's a good layout for first time. Impressive, actually. But..I would move the weight pot under the gain pot for a more traditional 4 control layout. Also, align the centers of C1 and the resistors above. Just looks better, IMO. Good job!