Try a local guitar/ guitar amp store. Usually those repairmen will have a tube tester. Likewise for radio/TV repairshops in your area. Good Luck.
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baaaaaa! Wrong answer. 6C33C take special tester. Doubt you'll find any radio, TV, guitar shop with one. There is a person on this forum who sells them, tested, for $60 a piece IIRC (just do a search in classified section). Perhaps he might be able to test for you. Also, I used to purchase them at PartsConnexion.com, which also tested them. They might help as well.
The 6C33 tube is extremely hard to test. The reason is its highly pronounced positive thermal feedback, turning any fixed bias testing into a test of your nerves. In reality I only recommend testing it using a servo-controlled bias circuit.
Barring that, your best bet is, in my view, to buy the tubes from the manufacturer, or to ask them to test your tubes, is they agree to do that.