There seems to be some Marshall Code 25's with a power transformer in the bottom of the cab and some without. What is the story, What is the difference and which is the newer model?
Actually after asking the question I thought "what a stupid question", I mean who cares really. It's just that I'm an engineer and I'm curious, and also there is no way to delete the question once you have asked it.
I ordered my amp from Amazon, and it was literally shipped in its box with no additional protection (and there is none inside the box either).
As soon as I took it out the box I noticed it rattled. The back is only held on with a few screws so I opened it to check what sort of damage had been done. It turns out there is a mains transformer fitted to the bottom of the case with 2 tiny screws into the particle board and these had broken away. I moved the transformer slighly and put the screws back into a new location. Perfect!
However I noticed on Youtube that there are a few people opening up the Code 25 for reviews and to change the speaker etc. They do not have a transformer and linear power supply like mine mounted on the bottom, instead they have a Switching power supply with no transformer mounted on the side of the cabinet.
On both models everything is inside the amp, its a mains connector directly into the back cover.
As I said it's just 2 ways of doing the same thing Linear and Switching PSU's both have Pro's and Con's. I just wondered which was the newer design, but as my Code has a manufacturing date of October 2020 I assume the transformer version is the newer. (or maybe both designs are still manufactured?).
