12V 12AX7 ECC83 Tube Valve Amp Fixed
Channel: Elecifun
Date: 2016-05-17

I made a mistake with the potentiometer and 4.7K resistor. I have  also connected the heater centre tap directly to the ground rail which made a big difference. 
The initial current draw is now only 400 - 500 milli amps, where as before it would go up to 2.2 amps. It settles around 200 milli amps, my power supply does not have the resolution to be precise 
I removed the POT and used the 4.7K resistor which helped but I found I had hum when switching the 4.7K for a 22K trying to get the bios to 50% of the input voltage. So I have put the pot on again and biased at nearly 50% VCC and used the variable 2K resistor on my headphones to blank the small amount of hum. I will leave it running now for half an hour and recheck the bias voltage and listen for hum etcetera.