The 200 watts was measured out of the amp, (Bird 43) I then checked just the rig itself and measured 25-30 out. I said that just after the 200 watt measurement. Probably should have phrased it better. But I hadn't thought about the driver. I'll check that as well. I have an old tube tester, time to use it. I realize I can't do much in that regard with the finals but I also have an old HW-101 that uses the same three tubes. A parts source in a pinch! On the 520se, I'm seeing 25 or so on 10, 50 or so on 15 and about 100 on 20 thru 80. My first rig in 1978 was the HW-101, spent much time on learning how rigs operate and alignment procedures. Time to refresh my memory and abilities and play with this 520.