Using an Extech digital multimeter will redplate output tubes if I attempt to set each output pair at 70ma. My old analog meter I could set at 70ma with no problems. Receiver is in top notch working condition and is restored. With my digital meter I set at 35ma, amp sounds good. My 340B holds bias very well and only drifts slightly between bias resets. The first time I used my digital meter it read 1/2 of what bias should be using the 2 test points, attempting to set at 70 redplated. If It was truly only set at 1/2 it would sound anemic and unpleasant. It sounds very good at approx 34 ma. It is almost as if it only reads the draw of one tube. My old analog meter has since been smashed in a fall so I have nothing to double check with. I have no problems setting bias to spec on my single ended 300B amp with the digital meter. My 340B does not have to get too far off bias before I can tell something isn't right. Currently both test points are holding steady at around 34 ma with very little drift and the receiver sounds fine. Any Ideas why I get these readings. The receiver is not a daily driver but I rotate it into duty a couple times a year for a month or more.