Looks very nice, with a simple parts list using widely available values. Pretty cool.

Excuse my ignorance, though, I do have a couple of questions.

Is the variable resistor rated at 250K or is that your volume pot. Is that a two gang volume pot, and if different, what's it's rating?

Not familiar with the symbol for the value on R7 and R5 could you edify?

Again, excuse my ignorance but are C2 and C3 on the modified schematic the 300uf ceramics shown on the power supply?

Finally, how's it sound? (smily)