Aren't those the tubes supplied with the amp? Are the tubes new, or are they 'getting up there'? By 'appropriate', do you mean 'will they work' or are you looking for something with a particular 'signature'? If so, you may be disappointed- Frank has often pointed out (putting words in his mouth somewhat, here) that, as a result of his design choices, his amps are less sensitive to tube rolling than many. All these considerations would come into play in answering your question helpfully.
FullRangeMan is probably right about where the thread should be.
Oh, and welcome to the circle!
