I am trying to build a clone of an old GA-1 RVT for fun. My latest posts of the build are here: https://www.tdpri.com/threads/help-to-fenderize-reverb-on-ga-1-rvt.960334/ There is trouble in paradise! It works but not completely. I will benefit from those that might recognize what is going on here. When the volume is rolled up off of zero it sounds good even on the crappy test speaker I have for first fire. The vibrato and the reverb work and sound really good, but at about 2/3 volume it just cuts out and there is a really high frequency tone for the rest of the volume pot range. The tone is steady but not very loud. I switched the secondary wires on the OT to be sure it was not a feedback oscillation. If I did not make some mistake in the circuit or assembly, could this be related to the bastardized reverb circuit that I shoehorned into it? Somehow interacts as the input load increases. The same sound occurs at any volume pot setting if I unplug one of the wires to the reverb tank which makes me think it might be related to the reverb circuit. Or did I just get a bad tube? The issue does seem to be a little inconsistent and seems to be affected by the volume control on the guitar. Hard to tell but it might be cutting out right as the input tube is starting to distort. Any help or insight would be greatly appreciated!