Thanks for the tip Phil, I'll check that resistor out. While on your website, I also read up on the operation of the 6AL7 eye tube and I must say mine does not behave that way at all!
One side is fixed at about 3/4 but the other side operates in the opposite way it should. When no station is tuned in, the bottoms of the two bars are level. When a station is tuned in, the left side bar is at it minimum
The 3.3K resistor in the socket has drifted up to about 4.3K but I don't think this would account for the odd behavior.
