Help finding old post regarding bassman "phasing"

[jlatrace]

My Tweed Bassman (5F6A) has developed a phasing sound when chords are played or notes are sustained (faint swoosh in and out of phase). A while back I found a post that addressed this issue but I cannot locate it. It's my recollection it's a phase inverter issue.

Can someone direct me to the post or potential solution?

Thanks.

[Bruce / Mission Amps]

My Tweed Bassman (5F6A) has developed a phasing sound when chords are played or notes are sustained (faint swoosh in and out of phase). A while back I found a post that addressed this issue but I cannot locate it. It's my recollection it's a phase inverter issue.

Can someone direct me to the post or potential solution?

Thanks.

Never heard of this problem with respect to the time tested good old long tail pair phase inverter within these amps.

[ThermionicScott]

Are you talking about "swirl"?