Best thing to do is re-tube,since you have no idea what condition the tubes are in from the last owner..I would take that as your first step..More than likely its a tube at the end of its life.....
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It does sound like a tube on its last legs. If you're new to tubes, I do recommend getting help from Upscale Audio. Bill from Morningstar Audio is another helpful resource (they're a dealer for Eastern Electric components). Vintage tube services (http://vintagetubeservices.com/Default.htm) is another useful resource, and the tubes are rated for use as Rodman suggests.
To completely retube, you'll need 2 12AX7's, 1 5751, and 3 12AU7's (unless you have the PV-llL).