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always a good idea to fuse the B+, even if there is a circuit breaker. I like to install a inline fuse holder, then just meter the current with a analog meter. Monitor the current on start up and select a fuse that is maybe 50% over the max current, or closer if you are the worry type (like me). I would rather lose a fuse now and then than risk a power transformer. I do this regardless of new or old filter caps, frankly I dont really trust new ones much more than old ones. and while on the subject of old equipment a bucking transformer seems like good insurance on really hard to replace stuff. That is something I have been meaning to look into.
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