I've completed my 300B amp and am loving it! I am routing the output through a 3-way switch; 1-Speakers, 2-internal 8 ohm resistors. 3-Balanced XLR Headphone Jack. Would it cause any issue to tie the negative going transformer outputs creating an unbalanced headphone output?

Finally- enough parts have arrived to begin assembly :) This is mocked up locations of tube/transformers Figuring out power supply layout After waiting on / mis-ordering parts / family issues (all good). I've finally got this completed!!!! Speakers are Markaudio Alpair 7.3's in Pensil Cabinets. /john