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Could be some of the cathode material has cooked off over the years. I've seen some rectifiers with powder inside from this. I generally ignore it as long as it works properly. I've got one 80 tube thats been in service for 81 years now. Its got a bit of powder, but the radio still plays.
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Random bits of stuff in the collection:
Yamaha YP-D4 turntable with B&O MMC 10E cart
Allied 495 receiver
2 Magnavox amps, AMP150 and an AMP178, currently under the knife.
Onkyo TX-4500
Onkyo Radian III speakers
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