I've built a Harvard 5F10 Clone that I'm quite happy with. I've been doing some measurements. I'm using the Mercury Magnets ToneClone Tranformers (FTWHARV-O and FTWHARV-P). I'm getting 376V at the Rectifier and 370V at the 6V6 plates. I've also measured a bias current of 18.6mA. Also, the voltage between the 220k bias circuit resistors is -35V. Comparing those voltages with the 5F10 schematic, they are quite different. Rectifier 305V, bias circuit -27V. Any thoughts about what that might have for an effect? Headroom differences maybe? Should I adjust that bias current higher?