Tube fuses on Jadis JA200 amps


Is there anyone that owns these amps that can tell me why the tube fuses blow. Does it mean the tube is bad? I retubed a little over a year ago and all of a sudden I've lost 3 fuses. I got 3 to 4 years out the last set(SED EL 34).I know the fuse filaments are microscopic. If I just replace the fuse it will hold for a while and then blow again. If I put a different tube in then the fuse holds. I know it sounds like I just answered my question but does someone have an explanation for me. Could it be power line surges?
128x128loki1957

Showing 1 response by ampnut

Dont forget to change the tubes as a SET,

Changing only 1 tube, will mate yr new tube, with labouring old tubes... killing the new tube Fast :-(