I think I have a bad tube.
When I touch the amp or tap the desk it's on I hear it in the left channel. When I rub my finger across the metal plate it even sounds trough the tube. Tapping the tube is, ofcourse, audible and quitte loud really.
This is mostly in the left channel.
This isn't that big of a problem. I have another more anoying problem.
It started with slight crackling every now and then whenever I wasn't listening to music and the amp was on. It happened regardless of volume. Anyway I guessed this might go away with burn in but apparently it's the Wi-Fi's fault. I tested it today and it picks up the signals. Shielding it with some heavy metal
makes the crackling/noise go away. I'm talking about the small input tube. When i'm downloading at full speed the noise is actually very load, around 80% of listening level. It happens only at the 2.5gHz band but unfortunately 5gHz is no option.
What's up here?
edit:
Ohhhh and I have another question.. Is it possible to use an PCC189 tube or an 6H23N "Rocket logo" tube with this amp? I have those laying around. I heard they are similar to 6992 tubes and that those are just lower in volume that 12au7 tubes.
So would they fit? I'd love to tube roll and it temporarily gets rid of the wifi interference.