I bought these off Tubedepot, and always checked the option of Balance and matching. The only way to know is to buy new Quad matched elsewhere and try again, but if 1 of the JJ is out of whack, then swapping sides will prove that right ?
Even with JJ swapped side, the balanced and offset just swapped over. I think you are correct as that this seller does not do Dual triode matching. However, I will still gonna buy those Philips but from Other place this time