2. amps-preamps
  3. 177597-119235

Rogue Hybrid Integrated fine, then one channel silent

Tried a different set of tubes that I purchased from a private seller (GE 12AU7) and all was working well and sounding great, listened for a couple of hours and shut it down for the night. Turned the amp on this morning, let it warm up for a 1/2 hr. and put some music on and right channel totally silent. After checking all cables from source and speakers, with heart pounding, thinking something went wrong with the amp, shut it down and put the original tubes in and all is well. I'm totally new to tube gear, is it possible for a tube to go bad overnight and there not to be any sound? Both tubes were glowing equally, really hoping it's the tube and not an issue with the amp

oldgzzrr

Showing 2 responses by oddiofyl

oddiofyl's avatar
oddiofyl
3,468 posts
 

Unfortunately that is one of the pitfalls of NOS tubes.   In theory , they should have infinite shelf life because the parts are in a vacuum.  Sometimes a tube will loose vacuum ,  but in that case the silver getter flashing usually will turn a white or Sulphur color.   

I honestly think a lot of "NOS" tubes aren't really new , they are used that test strong.  I usually only buy NOS tubes from Upscale or Brent Jessee.   

 

oddiofyl's avatar
oddiofyl
3,468 posts
 

For what it's worth I am using g JJ 12au7 Gold pin in my preamp and they sound excellent. 

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