Could be a short in the 5 volt winding on the power transformer. The stock Dynaco power transformers are under-sized for the circuit's tube load. If so, buy a higher-rated power transformer.
Need someone to look at my Dynaco 70
Happy New year,
My modified Dynaco 70 has started popping the main fuse. It also blew the rectifier tube (GZ34). I installed another fuse and tube and after playing for a while, it blew the same fuse. I didn't install another rectifier tube, deciding it'd be better for someone to see why the tube is blowing before potentially wasting a new tube. I am in the Sacramento area, does anyone know a person who has the expertise to diagnose what is happening?
Thanks in advance.