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Just fuse the plate leads with #47 bulbs. If the 6X5 should heater-cathode short, the bulbs will expire immediately, much too quickly to put your transformer in danger. I have yet to experience a 6X5 failure myself and have not a tiny number of sets that use it, both radio and TV. One of the TVs uses it as a damper! So taking the bulb-fuse precaution is definitely worthwhile, but don't be scared of the things.
Last edited by David Roper; 11-07-2015 at 03:46 PM.
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