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Help me diagnose the problem

I've got a Rogue Tempest II Magnum. A couple weeks ago I heard a 'pop' and then noticed that the left channel wasn't quite right. Further probing led me to the KT90 in the V1 position- it was not hot to the touch. Mark at Rogue suggested I check the fuse to V1. Sure enough, fuse blew. Tip off was the tube could not be biased. Put in a new fuse, and we're good.

Today- I heard something not quite right from the left channel again. Popped the lid, saw I could not bias V1. Pulled the fuse and it was blown.

2nd V1 fuse blow in as many weeks.

Why am I blowing the V1 fuse? FWIW, the amp is nearly 4 years old. Could a tube issue be causing the V1 fuse to blow?

Thanks!
128x128zavato

Showing 3 responses by zavato

zavato's avatar
zavato OP
1,390 posts
 
I am going to move the suspect KT90 to a different tube socket. If I continue to blow the V1 fuse it's not the tube. If I blow the fuse corresponding to wherebI move the tube, It's the tube-
zavato's avatar
zavato OP
1,390 posts
 
I hadn't called Rogue- I plan on doing so on Monday, but I already heard from Mark. On the Rogue each tube is individually fused and biased. So far after switching things around the fuse is still holding but I have been exceedingly careful to play music at very low levels. I feel the errant tube is shorting when pushed and thus blowing a fuse.

Supeisingly I have not had any success yet finding replacement fuses. Nothing at Radio Shack or at a local musical instrument store in stock of the correct value.
zavato's avatar
zavato OP
1,390 posts
 
Tubes were ordered today. Fuses too.
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