On Wed, 6 Jun 2018, Ron Hardin wrote:

My Superradio III just died, after being on 24/7
for around 20 years. I think the varactor
governing tuning failed.

But you haven't really described any problem. Varactor tuning is hardly
gonig to fail magically. If the voltage isn't there to tune them, then it
won't work. I suspect something else. You imply that something on the
radio works, but since there are no details, who knows?

Michael