Breaking news on the Bassman front! After a bit of recent correspondence with Fender, I have some news to report which varies slightly from what I wrote in my
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In my review, I highlighted a quote from the user manual which stated that "A speaker must ALWAYS be connected to the MAIN SPEAKER jack when the amplifier is ON or damage may occur to the unit." This seemed contrary to what I thought the Speaker Output Mute switch was doing, but since Fender put it in the manual, I wanted to be sure that people were aware of that.
However, the engineers at Fender now tell me that if the Speaker Output is set to Mute, the Super Bassman can be safely operated without a load (meaning, without a speaker attached). There is no high voltage power supply to the output section when the Speaker Output is set to Mute, and you are good to go.