Quote:
Originally Posted by Kevin Kuehn
The 5Y3 requires a 5V filament supply versus the 6X5 uses 6.3V. Also the current draw may be different? I was not aware that there is a known failure problem using the 6X5GT. Thought that was only with the original 6X5. 
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The NOS one that went bad on me was a 6X5GT....