I'm not that knowledgable about tube amps so I'm hoping someone might have some thoughts
My rogue audio tempest ii is a kt88 60wpc tube amp. What happens is after the amp has been on for a few hours there is a sudden bass sound like when you unplug an rca cable but continuous in one speaker. I went to the amp and can see the power tubes filaments glow fluctuating, and even some sort of glow on the glass that is also fluctuating.
I checked the bias and it's completely erratic across all tubes, perhaps more on one one tube than others. This comes out of nowhere, even when there is no music playing.
Is it just bad tubes? This is across all tubes although the sound seems to only come from one side. I recently installed new 6sn7 tubes, could that have an affect?
My rogue audio tempest ii is a kt88 60wpc tube amp. What happens is after the amp has been on for a few hours there is a sudden bass sound like when you unplug an rca cable but continuous in one speaker. I went to the amp and can see the power tubes filaments glow fluctuating, and even some sort of glow on the glass that is also fluctuating.
I checked the bias and it's completely erratic across all tubes, perhaps more on one one tube than others. This comes out of nowhere, even when there is no music playing.
Is it just bad tubes? This is across all tubes although the sound seems to only come from one side. I recently installed new 6sn7 tubes, could that have an affect?
Swap the tubes across channels. If the symptom follows a tube to the other channel, then the tube is bad. If nothing changes, then there's trouble inside the chassis.
I'm going to contradict and suggest you take it to a tube hifi tech instead. (or maybe a tube savvy diyA member)
Could be as simple as a cold solder joint or intermittent component which would be harder to find. Or a socket problem, or countless other things I'm not going to try and guess at.
Could be as simple as a cold solder joint or intermittent component which would be harder to find. Or a socket problem, or countless other things I'm not going to try and guess at.
I put the old 6sn7 tubes back in and there's no problem now. Im wandering if either a tube was bad or having new tubes is exasperating another problem in the amp.
I'm thinking of just jumping in and replacing caps and resistors throughout.
I'm thinking of just jumping in and replacing caps and resistors throughout.
Based on what you've said the answer is probably a bad tube, and why would this drive you to shot gun the unit? One is not necessarily connected with the other.
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