Quote:
Originally Posted by radio nut
...I have been subbing 5y3 rectifier tubes in my radios instead of 5u4 tubes. Is this a mistake?
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Just curious, but what radio(s) do you have that use 5U4s? Being heavier duty with a 3 amp filament, they were more exclusive to TVs and large amplifiers. Whereas 5Y3 with its 2 amp filament was more commonly used in radios.