I haven’t been running these JJs for very long, but it seems like daily use is too much for them. One of them has been noisy from time to time, which mostly stopped happening when I biased them cooler. Yesterday another one red plated, and blew the fuse. I replaced the fuse, and while it warmed up again without noise or red plating, the bias is way off on both sides now. Regardless, these JJs are having too many issues for me to bother with them anymore. I’ve disconnected the Dynaco for now while I look for a good deal on some NOS Siemens/RFTs, which seem to be the best deal on vintage EL34s at the moment. They certainly don’t make tubes like they used to.