Question for the 6SN7/6F8G experts here
sorry if this is a topic that has been raised, but I haven't found a solution.
I am running 6F8G drivers on my Bottlehead Crackatwoa OTL using a 6F8G to 12AU7 adapter. They sound fantastic, running Tung Sol VT-99 flat black plate primarily. However, I am getting right channel buzzing with the 6F8G. I suspect the tube is picking up power supply noise and is not properly grounded. If I move a finger close to the top cap, the sound is amplified. If I touch the top plate of the amp, the sound is diminished.
Has anyone come across this issue? Is this an inherent part of using 6F8G's? I am wondering if there is an effective way to simulate my touching the amp with a ground wire perhaps. It's forced me to use lesser 6SN7's, not quite as good as the VT-99, but without the incessant buzzing. I appreciate your help.