Assuming you unplugged and plugged the proper way and the tube does not show any play on its integral base then check amps tube base for any slack or whether there is a broken joint. Seems to be a bad connection (rare medium pop) and hiss from that channel.
Wiggle kt170 base
Hello everyone,
The sound on my tube amp was pretty good with the kt170. But I made a mistake. I took out the 4 kt170s and put in kt120 to understand the differences more. Next day I put back the the kt170 each into their exact slot from before.
There is hissing on the right speaker and a rare medium pop now. The very left kt170 has a very slightly loose base. Does this affect sound? I have no more intention of removing the kt170s if the loose base doesn't affect sound I'm fine to leave as is.
Could you teach me more about this hissy sound? I didn't touch any of the pre-amp tubes and they are all mostly nos. The hiss is softer today than it was yesterday.