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Thanks for asking.
All rectifiers are gone but I have one last U52 in case of interest.
Sorry to hear this.
If the guide pin its missing I put a small red triangular sticker on the base with the arrow pointing to the pin guide...
I don't like the exposed contacts on the side of the base.
They don't look very safe.
I have used 5670 to 6SN7 adapters/tubes with good success.
Happy New Year!