Troubleshooting help. Dallas ac30

[davebolden44]

Greetings. Could use some expert advice in troubleshooting some parasitic ghost notes I am getting in this 75 ac30 I got. I recapped the amp and changed a couple bad pots. The amp sounds really great minus the annoyingly faint half distorted mosquito/wishy washy note that trails every note I play. Amp is quiet sitting in idle. I have changed every tube in the amp one by one and it still persists. Any techniques solving this type of problem would be greatly appreciated.

[pdf64]

What channels does the issue occur on?
What control settings affect it?
Have you tried it though a different cab?

[davebolden44]

It occurs on all channels and control settings dont seem to remove the issue. I have not tried another cab but the thought crossed my mind. I dont have another 16 ohm cab but I may have to set up a test with 2 of my large 8 ohm cabs in series. For now I am waiting on parts as the new issue of redplating has surfaced. Need to cool the bias down first at this point.

[davebolden44]

Oh it is so definitely the cabinet....