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I realized tonight that my TV has a 5u4GB so I popped it in and voila! It did run really hot though. I gather that's normal since it's part of the power supply circuit (whereas other tubes don't tend to run so hot)? It also runs hot in my TV.
As I've read, it should be a reasonable substitute for the 5u4G and in fact the blown one that was in the radio was also a 5u4GB. But if it's an inferior substitute and is likely to have a short lifespan, maybe I should bite the bullet and pay the higher price that 5u4G's seem to command. Any thoughts on that?
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