Dave wrote:

...
I do SMD rework occasionally, with MagEyes. You'd use a power amplifier
for a pre-amp?

For some? ABSOLUTELY!

Like, is the loop completely shielded? How efficient of a loop are we
speaking of? Etc.

But in all cases, yeah, I would provide for much more amplification
factor than I will ever need, why not? I mean, do I really need the 454
with blower in my "toy car?"

Regards,
JS