Balanced B1?

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Is there a balanced version of the B1 floating around? I am pretty newb when it comes to SS (better with tubes).

I was thinking of making a buffer to switch between 3 inputs in my combined system (HT & Music). 1 would be XLR from DAC, 1 RCA from phono, 1 XLR HT bypass. Output would be XLR into my Crown amp. Obviously I need to convert SE>Balanced for the phono. I don't think I need any gain, so a buffer would work well.

I have a small stash of 2sK170.
 
I'd like to see one too. I have a few parts to build a single ended DCB1 variant that a member was selling PCBs for. I'm new to balanced circuits. Would you not need 2 B1's to do it properly? I'm not sure, but always thought that was part of it... so looking forward to this thread and where it goes.
 
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