6CA4 - EZ81 - 6V4 -EZ80
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The 6CA4 and EZ81 are equivalent and can be used interchangeably.
The 6V4 and EZ80 are equivalent and can be used interchangeably.
With the 6CA4/EZ81 and 6V4/EZ80 are similar tubes, you can only substitute a 6CA4/EZ81 for a 6V4/EZ80 but not the other way around because the 6CA4 can handle higher plate voltage.