Ramsey Electronics PG13 Instruction Manual page 36

I will admit that this experiment is difficult to reproduce due to the low power
involved on the output terminal. If I had added more parts to the kit, then you
could draw a hotter spark. The problem is that we also run into other problems
too, like power dissipation—the heatsinks would no longer be adequate, and
strange oscillation effects caused by the varying load conditions. We couldn't
cover all cases in this project, so we had to compromise! We hope however
that you will be more than satisfied by what the PG13 will do.
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PG13 36