phft Tube Tester ........ they Glow Orange.
I did have an issue with most of the radios, needing the tubes moved around in the sockets or removed and put back -there seemed to be a slight pin to socket corrosion issue once they were wiggled around al little, they lit right up
Yes but a tube lighting up is only a small part of its function. Tubes can light up and still not work. Corrosion in the sockets is a sign of bigger problems. The switches might not work because of that and, so, the tube sockets and switches might have to be replaced.
In any case, it sounds like it really isn't worth the money to have someone fix it unless they'll do it for free. You'll end up putting hundreds of $$ into it and it will only be worth $50... IF anyone wants it. Check Ebay for their going price or do an internet search to see what their resale might be today.
"AM" radios were popular in the 60's & 70's but are almost unheard of in Amateur Radio today...