My nearly 3 year old J/J GZ34 started arcing and took the fuse yesterday. Local guitar shop had only a 5U4GB. The GZ34 is indirectly heated, but the 5U4GB is directly heated. I assume the 5U4 is faster to start, but can't find any ratings that say so. Bad for the EL34s? From the charts, looks like the 5U4 might have a higher B+, but can't say for sure. I'm using the triode electronics supply transformer (PA060) which has a 4A rated 5V heater winding, so I'm OK for it drawing a bit more filament @ 3A compared to 1.9A for the GZ34.
Should I get another GZ34?