Cliff Jacks: Switching Combo Amp's speaker

Please see thread: https://www.tdpri.com/threads/convert... Here I have two combo amps - both oluf which can SEND their amp output to an external speaker - and in doing so they switch off the internal speaker. What I have done with the Fender Champion amp is to allow an external speaker cable to route from another amp to its speaker (disabling the input from internal amp). PLEASE dont do this on a valve/tube amp. Not only might it blow your transformer - you might kill yourself on the dangerous high voltages. I take no responsibility for your actions here. I wanted to see what the Laney valve amp sounds like thru a 10" Celestion speaker. My late father-in-law raved about these speakers - for good reason. Added bonus - the Fender amp thru the Hartke 4x10 XL is killer! Way to loud from at nominally 25W solid state ... it sounds much louder than that!