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Since you have not specifically given much details other than you have sound, and all tubes seem to be lit OK, but not much other than that is known, not much to go on.
So starting with the basics, is there HV, or not, 19-20kv?
If present, then each element on the 15GP22 should be checked to see if they are within their normal ranges, this should give you some idea where to start is one or more is way off target.
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