On Saturday, March 30, 2024 at 10:37:21 AM PDT, Jim McClave via Jukebox-list jukebox-list@lists.netlojix.com wrote:

Still working on the loud buzzing noise problem on the A.  Cant really> tell if the noise is coming out of the speaker or somewhere else.  Is it> ok to temporarily disconnect the speaker plug without damaging anything> else?  I know B+ goes thru the field coil.  Jim

You can safely unplug the speaker.  I would associate "buzz" with amechanical condition, and "hum" with an audio condition.