Firing up old tube amps. Should I worry?

Marlin38,

How about pulling the signal and power tubes.

If the rectifier is a tube you will need to leave it in.

If you are worried about powering them directly off the mains put some kind of load in series with an amp first.

The wife's toaster or maybe an iron. Something with around 500 watts resistive load.

Fire it up, sorry couldn't resist, and check power supply dc output voltage. Leave it on for a minute or two.

If no smoke plug the amp directly into the wall recept.
Check power supply DC voltage.

If everything looks OK unplug amp install tubes.

A couple of cheap speakers might not be a bad idea for the ultimate test.
.

Find a repair shop with a variac or buy an inexpensive one. There is a good chance you will need it again in the future.

Don't say FIRE up
Alan

99% it's safe to turn them on.
I believe that this amp has good quality old school parts and despite it's better off recapped it should work.
Don't be paranoid.

The amp should NOT be powered up unless you monitor voltage while running the amp up on a variac. Either buy a variac, or bring it to a tech who can do that for you. If you value the amp, start it up that way especially if the company is no longer in business and replacement parts may not be available. I do that with equipment that hasn't been run in 5 years as well...