I'm a bit late to the party here....
I believe when you disconnect the loudspeaker plug, which is a EM (Electro-Magnetic), it will disconnect the B+ as the field coil is connected in series.
Don Resor
-----Original Message----- From: ascott822--- via Jukebox-list jukebox-list@lists.netlojix.com Sent: Tuesday, August 19, 2025 8:11 PM To: jukebox-list@lists.netlojix.com Cc: ascott822@aol.com Subject: [Jukebox-list] 780 fuse blowing issue
Still trying to chase down the reason the amp fuse blows. I replaced the 5Z3 tube for the chance that it might have a short as was suggested. That wasn’t the cause. I removed all plugs into the amp and made selections and as I replaced one at a time as a process of elimination. The fuse only blows when the speaker is plugged in. Any help please. Thanks, Allen
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