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First time working on the Spark Practice Amp. One came in with a damage input Jack.  Nice Product, well thought out design, and even sounds decent.  The owner originally requested adding balanced Lineout, but ended up not going for it.  The headphone out seems to do the trick, all be it unbalanced.


They added this thing RED epoxy glue to the input PCB, which was fun to remove cleanly. 

Spark Input PCB

The glue took a bit of the solder mask with it....but it came off.

When I assembled I used silicon instead.

SPARK Input PCB back in