Re: UY41 Valve.
Apparently from that thread, the UY42 was from some point in time deemed suitable for higher voltages. This is the same as I remember from the rumours, there might even be a Dutch service bulletin on it regarding valve replacement in certain sets. If they had relabeled UY41 production as UY42, this would have shown up in the code lists. A bit to my surprise it doesn't, so it's likely just some improvements to the UY42 specs.
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