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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

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42659
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Strange your fuses go out so quickly. I had a Jadis defy 7 amp for 3 years with no fuse problems using Sev 6550 tubes. My current Cat JL2 amp which I have owned for 5 years requires tube replacement about every 3 years using Sev 6550.

I would suspect a bad tube or two or perhaps a faulty resitor in your amp. Troubleshooting with so many tubes and resistors can take much effort to isolate.

Johnny
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