I thought the original speaker, aka the '57 required a constant charge- and that the later models didn't. But I can dig down a little.
Are these the models that were manufactured in China? There's another recent thread on here about panel failure due to the glue.
I used to keep mine- both the '57 and the '63 plugged in 24/7 but different speaker. More if I find an answer or if someone else with knowledge of this Quad posts here.
Yeah, typos, the bane of my existence. And auto-correct makes it worse sometimes....
