Hello everybody, my name is Robin and I'm new here. I built a vta st120 and after a few minor issues got it up and running great. Now today I checked the bias. On the two front tubes it reads 40 or more vdc. the back tubes bias fine but I can't get the front ones to go down. I have swapped tubes and it is still the front tubes that read high. So I am assuming it is the amps problem cause it only happens in front. Any ideas or suggestions would be greatly appreciated. Thanks
Hi, I figured it out 2 of the 2watt 10ohm bias resistors failed. Anybody know why? Will it be ok to replace them with higher wattage 10 ohm resistors? Thanks
Hi, I figured it out 2 of the 2watt 10ohm bias resistors failed. Anybody know why? Will it be ok to replace them with higher wattage 10 ohm resistors? Thanks
Last edited by rilayton on Tue Dec 02, 2014 2:43 am; edited 1 time in total (Reason for editing : found the cause of high bias voltage)