I'm getting a random, intermittent, static buzz in the left channel of my Crack.
When I turn on the power, I'll get a brief period of similar noise in the left channel but it quietens down after a couple of seconds. At first, the left channel would be quiet for about an hour, then the static/buzz would begin again intermittently. I didn't know if I might have a questionable solder joint, a failing tube or something totally different, so I decided to wait a few days to see if anything changed. Its been a week and now the static starts almost immediately, but is still intermittent and only in the left channel.
Any suggestions on how to debug this? If I try swapping out a tube, should I start with the 12au7?
Thanks.
---todd