The first step is to swap the left and right channel tubes,if the popping moves to the left channel then you will know it is a bad tube.
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thanks you guys. i swapped the tube and it did switch the problem to the left channel. i think @atmasphere, that you are correct. i had to replace one of them before. can you recommend any good brands or places to get new tubes? also, do you think its a good idea to replace all of the smaller tubes so to avoid issues in the future or is that overkill?
thanks again you guys, I swapped the pre-amp tubes back to original configuration and left the power tubes swapped. ended up getting the pop sound on the left again. does this mean that it is in fact a power tube and not a pre-amp tube?
the tubes i have right now are,
4 Primaluna KT88
2 Primaluna 12AU7
2 Tung-Sol 12AX7
So, i waited a bit longer and turned on the amp again and this time. still with the same configuration as above. all pre tubes in the original position and the power tubes in the swapper position. this now results in there being a pop but i don't lose all of the sound on the left channel but the same pop is heard it just doesn't cut out the signal completely. im going to get some new primaluna KT88s from upscale audio.
It seems that logical adaptive auto-bias board needs attention.
There's an instruction page http://www.primaluna-usa.com/index.php?option=com_content&view=article&id=118&fb_comment_id=fbc_287873517993116_2045910_394667337313733#f22d93128