Can anyone recommend a good (obtainable) 6X4 tube?

I own a Eastern Electric MinMax tube preamp. I really like this thing.

The only stock tube remaining is the 6X4.

Can anyone recommend a good (better) sounding, but obtainable, 6x4 replacement tube?

Thanks,

Tim
Norh ACA-2B tube pre, Sumo Andromeda SS amp. Magneplanar MMG speakers, M&K MX1250 Subwoofer, Pro-Ject RM1.3 Genie TT with Sumiko Pearl MM cart., Keces DAC, Cambridge Audio Azur 640c CD player

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