Unless you are willing to pay over $50K for someone with the skills and
experience, good luck. Most people with those skills and experience
are already gainfully employed with a larger firm with full benefits.
Unless they are total losers.

There is such a big shortage of biomedical electronics technicians
nationwide, many people leaving the consumer electronics repair field
with 2 year are better degrees, are upgrading training with anatomy and
physiology, chemistry, and if possible a couple of biomedical
electronics courses. Starting pay is not bad, not super good either,
but it is a very stable field with generally good benefits. $15.00 hr
to start with very little experience and lots of on the job training,
plus full medical and 401K. Typical $20 hr after 5 years. Add the
fact it is a relatively easy job for someone to move over from
electronics repair, and many people are looking at it.

There is also a good possibility that the ad you have been running is
very poorly written. Most good technicians are already employed and
have no trouble finding employment, barring a big company layoff of a
large number of technicians at once. You have to provide enough
details about the job, reposibilities, and pay scale/benefits to
recruit people who are already employed. You will have to make sure
you pay and benefits are at least average for your area or better.

Where are you at?