I have a singled ended Rickenbacker M8E that I use as a practice amp, both for playing and for learning about amps. Lately I've been reading about power tube biasing, and I decided to take some measurements. Here's what I found in my Ric: Plate voltage to the power tube = 340V current drawn by the tube = 34mA First, I'm wondering if I took my measurements correctly, as 340V and 34mA are suspiciously similar numbers. I measured plate voltage by probing between pin 3 and ground. I measured current draw of the tube by probing between pin 3 of the power tube and the pin 2 on the 5Y3, which is where the red wire of my OT runs to. Assuming the measurements are correct, maximum plate dissipation for a 6V6 is 14 watts, so the tube is running pretty hot at 82% of the max. I believe this amp is cathode biased, though I'm not sure. I've attached a fairly accurate schematic for someone more knowledgeable to inspect. My questions: is the tube running too hot? The amps sounds fine, I'm just concerned about burning through power tubes. In order to lower the current draw, how do I determine the proper resister value to swap in? I'm assuming I would be changing that 270K resistor on pin 8?