Try cleaning the pins with denatured alcohol or 99% isopropyl and carefully clean sockets with a non bristle pipe cleaner and a tiny amount of alcohol.... then when everything sounds great , sitting down with some of your favorite alcohol is in order.
Tube amp crackle noise with pre-amp volume at zero.
I changed out some stock EL 34s with a brand x on my prima luna Dialogue HP amp. Within seconds of powering up the amp with the pre-amp volume all the way down, I herd a crackle like noise from the speaker. It was somewhat intermittent and random between the two speakers. I shut it down, checked all connections, and started again with the same results.
I returned the stock tubes and everything is normal. What happened? I didn't have the guts to increase the pre-amp output! Tube microphonics? (spelling?)
I returned the stock tubes and everything is normal. What happened? I didn't have the guts to increase the pre-amp output! Tube microphonics? (spelling?)