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It's unlikely to be a tube and certainly not all three of them, either way it doesn't matter what brand they are, VM never made tubes as far as I know, they probably just had them branded with their logo.
I would be more suspect of a bad connection somewhere between the cartridge and the Amplifier, it could even be a bad cartridge, it's fairly common for 50+ year old Ceramic cartridges (even new old stock ones) to start getting flaky.
Next time it fades out try tapping the tone arm around the cartridge with a Pencil and see if it cuts back in.
It's also possible that whoever recapped it forgot to solder a connection.
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