2. amps-preamps
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DAM Broken tube?

When putting the KT90 output tubes in my new Rogue Cronus Magnum, I heard something rattling around in one of them. The other three are quiet. Does that mean the tube is definitely bad and I should not power the amp up?

I wanted to have it up and running in a couple hours.

When I picked it up at UPS, they had the box standing on it's side despite arrows on the box showing it should be laid flat and fragile symbols. When I pointed it out they said "Oh we don't do that", referring to following handling instructions on boxes.
bajaed

Showing 2 responses by bajaed

bajaed OP
269 posts
 
Thanks for the responses. It does seem to my uneducated ear that it could be a heater filament, I could not see anything rattling around.

Everything is working and it sounds incredible! Beautiful, deep sound stage.

I may have an interference/ground loop problem. When no music is playing, I'm hearing a mild to moderate hum or buzzing. The amp is in a shelf just under my TV and behind it is a power strip that the TV, BR,AVR and Rogue are all plugged into. There is also an amp right behind the Cronus that the cable company installed to boost my signal(would it be the main suspect?).

A couple feet to the left is a separate outlet that my turntable is plugged into. A couple feet to the right is an outlet the cordless phone is plugged into along with one of those small 2" desktop fans I was using to pull heat away from the amp.When i turned the fan off I heard a click through the speakers but the buzz remained.

Does this sound like a grounding issue or could it be a bad tube? Like I said, music sounds great just noticing the buzz when it's quiet.

I have a pro coming over this week to check my setup and get it dialed in. Could the buzz hurt anything in the meantime?
bajaed OP
269 posts
 
Found the source of the buzzing, it's my Plasma TV. LG 60PS60.

Any way to fix it? Is it hurting anything?
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