As an update. I’ve replaced the stock 6L6S with Svetlana 6L6s, V1 has a Genelex Gold Lion gold pin 12AX7, V4 and V6 have JAN Phillips 12AT7WC, all other tube position have Mullard Long Plate 12AT7s. I’m not really sure how much difference the Svetlanas made over the Mesa tubes. The Genelex Gold...