Lucky you! Unfortunately though, you don't want to mess around with rectifier or output tubes unless you know their condition. These can damage the circuitry if they are bad. Small signal tubes like 12AX7 or 6SN7, etc. are another story and less likely to cause damage though they can in extreme cases. If you are tempted though, at the very least try to use them in the same pairings from the gear they came out of and watch and listen to your amp closely for trouble. If you think no one in your area can provide testing or matching for you, look in the direction of musical instrument amp people. Even the local music/guitar store may be able to test and match tubes for you.
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