How does the BHK handle DC voltage on its input?

I recently had a situation where my source was putting DC on one of the inputs of my tube power amp.
The tube amp did not like it but at least it could not put DC on the speaker terminal.
I am considering the BHK and wondering how it would react to DC on an input?

As long as the DC isn’t too high it shouldn’t be a problem sonically - and it will never be a problem passing through to its outputs. The vacuum tube input stage is capacitor coupled to the MOSFET output stage. No DC can leak.