AVS Special Member
Join Date: Nov 2001
Location: College Park, MD
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One thing to keep in mid when "documenting" Channel Master preamps is that they are now using completely different preamps sporting the old familiar and trusted part numbers.
Given the way that parts prices have steadily declined, I'd expect that any preamp designed in the last decade has an onboard voltage regulator chip. And at some point, linear power supplies in wallwarts will be ancient history. I remember back around 1980, seeing a couple of electrical engineers ridiculing the first switching power supply they had ever seen because its filter capacitor was, by their estimates, way too small. It could be that all the new ones are switching. I have no way of knowing because I have no reason to break one open. My time is too valuable to repair one so if I ever do, it will only be under duress.
Are there any modern (i.e., designed in this century) wallwarts with the slip in plugs that have positive sleeves? My Drake TSM1000 meter had one, and when the charging jack wore out, Drake had to cut a 1" hole in the chassis and pop rivet a piece of fiber circuit board to support the replacement jack because the chassis was negative but Drake didn't have any panel jacks with the outer conductor insulated from the threaded mounting body..