On my last build I'd fitted 1ohm/5% resistors between pin 8 and ground on both 6v6 tubes, along with a bias pot. I get 420v between pin 3 and ground with a 5u4- does that sound about right? The PT is rated at 330v/138mA. Multiplying the plate voltage by the voltage drop across the resistor gives me 8.1w, well below the 70% threshold on the JJs. I can imaging variations in the 1r resistor potentially affecting the reading, but is it still good enough or do I need a more accurate method. Sounds very "brownface" at the moment, which I like!