I'll repeat the advice not to turn it on any more. You won't learn anything additional and you may burn up components that cost more than the set's value to replace.
It's a nice looking TV, but the collector value, unfortunately, is minimal. A 1955 black and white set is just new enough to be uninteresting to collectors, who prefer earlier 1940s b/w TVs or the earliest color TVs.
Around here (west coast), I commonly see mid-1950s b/w consoles listed on craigslist for low prices and I believe most of them go unsold. TV collectors aren't interested for the same reasons that a car collector isn't interested in, say, a Ford Taurus. Too new, and hoarding them for the future would be silly.
Every 1950s TV has several dozen capacitors that need to be replaced before it's safe & reliable to play:
http://antiqueradio.org/recap.htm .
If you want to keep it and have it restored, this article has some advice about finding a repairman:
http://antiqueradio.org/howfix.htm . Unless money is no object, you'll want to find someone within driving distance. I'd go this route only if you want to keep and use the set indefinitely, since the expense of a professional restoration might exceed its reasonable resale value.
Phil Nelson