To OP.
As sad as it sounds, check the tubes again.
I bought an amp from Sweetwater a while back. Had issues, replaced with brand new tubes. Issue still there.
I had a return ready to go, packed in the box ready for after work. My buddy convinced me to try different tubes. I gave it one more shot before going to UPS. Sure enough, the brand new tested tubes I bought were bad.
As sad as it sounds, check the tubes again.
I bought an amp from Sweetwater a while back. Had issues, replaced with brand new tubes. Issue still there.
I had a return ready to go, packed in the box ready for after work. My buddy convinced me to try different tubes. I gave it one more shot before going to UPS. Sure enough, the brand new tested tubes I bought were bad.