I love it too. I just want to know what would happen.No clue but I love mine the way it is and the loop makes it great for a 1w power amp
Which would give the most round tones, like bass response12AX7 will sound shitty in that spot. You could try 12BH7, 12AV7 (5965) , or 12AT7.
The AX7 will sound more gainy but in a bad way.