donniecrump
Member
So I have an odd issue. A few days ago I re-tubed my Rockerverb MKIII. I had originally bought a quad of Groove Tubes KT77. One was broken so I used the other pair and 2 matched pair of JJ branded ones I had.
So they are like this away from the input. GT - JJ - GT - JJ
I got everything biased and started testing everything out. When I fired up the amp I noticed that the second GT was not glowing. I was still getting sound out of my amp with all settings turned on full power.
So ... I gently tapped the tube with my fingernail and it started warming. I am pretty sure that with a gentle tap that it is not my amp. I was curious if anyone else had seen this type of issue with a tube.
So they are like this away from the input. GT - JJ - GT - JJ
I got everything biased and started testing everything out. When I fired up the amp I noticed that the second GT was not glowing. I was still getting sound out of my amp with all settings turned on full power.
So ... I gently tapped the tube with my fingernail and it started warming. I am pretty sure that with a gentle tap that it is not my amp. I was curious if anyone else had seen this type of issue with a tube.