The bias setting is calculated the same for any tube amp. Plate volts times Plate current equals Plate idle wattage. Typically the best range is 50% to 70% of the tubes max Plate wattage rating. For a 6L6 tube, the max Plate watt rating is 30 watts, so 50% to 70% would be 15 to 21 watts. Similarly calculated, a 6V6 tube max Plate watt rating is 14, so the math is the same, just use 14 instead of 30. Using a bias probe, measuring Cathode current, is close enough to Plate current for biasing purposes.
I will send a PM with my email address, and if you send me a copy of the schematics, I can list the preamp functions. If the EC is similar to other Tremolux amps, V1 (7025/12AX7) is for the normal channel, V2 (7025/12AX7) is for the Vibrato channel, V3 (12AX7) is for the Vibrato effect, V4 (12AT7) is the phase inverter (PI), V5 and V6 are output tubes, and V7 is the rectifier.
---> "The amp should be SWITCHED OFF AND UNPLUGGED before you do this!" <---
Por favor, disculpe mi español, no se llega a la práctica con mucha frecuencia.