Don't waste your money buying all new tubes -- even as spares.

When I bought my second Hallicrafters SX-28, it included a box with three to
four sets of new replacement tubes. The original owner had stashed them away
in case of need. He only used a couple over the years, then sold the rig.
The second owner hadn't used any, or perhaps one or two. Even if I ran this
radio 24 hours a day, I doubt I could use up all these spares any time soon.

Your radios use common tubes that are cheap and readily available. I don't
think there's any point in hoarding spares now.

Regarding performance, I second the advice about doing an alignment and
using a good (i.e., long) antenna.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html