lewm, asleep or awake, how can one avert damage to speakers by a blown output tube?
Years ago I damaged two woofers in my Duntechs when a phono stage I was auditioning for a manufacturer sent DC through them. I was awake but don't know how I could have prevented it?
Otherwise regarding changer complexities, just go to the Dual heading at Vinyl Engine and look at repair procedures for any of the older models. A friend offered his 1229 he no longer used but a review of the restoration quickly eliminated that kind offer.

