2. amps-preamps
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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!
zavato

Showing 1 response by slikric3000

slikric3000
638 posts
 
I got the same crap, ain't the fuse though. Something more evil. Pops are tube like at least in my short experience, mine was two thumps. Anybody know what the thumps may have been ?? I got some cheap PCC88's from across the pond, a well known brand, I forget I would have to dig them out, pop and that was the end of the tube. It would still work but with static. A couple of those tubes popping and they came out.

I suspect my thumps were caused by moving my speakers a few inches, at least that is what I was doing when it happened.
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