When I got back into music in the early 90s I had a Deluxe 85 from the same product line. I work on a lot of amps but admit haven't been inside any from the era of the red knobs. For reasons I can't explain, these red knob amps have a bad reputation. I know a fellow who plays lead guitar in a blues group and has been using the The Twin like yours for almost 20 years. No problems at all with it and the amp sounds fantastic.
If you're liking how yours works and sounds, be content with it and don't listen to the negative comments of others unless they have substantial information to back up the gripes.
I've worked on a number of them. The bad things are the gain channel and the printed circuit board construction. The good thing is that they kept the traditional wonderful Fender clean channel.
Like all the Twins before it, it's big, loud and heavy! The Red Knob came out at the turn of the 90's and they added a MV and some extra gain. To my ears, it didn't really work. It sounds too "fizzy". The clean circuit was the regular BlackFace wiring and sounds just as good as any other Twin.
The printed circuit boards are your usual awkward and chintzy boards that are a PITA to work on. To change a control you have to take the nuts off ALL the front panel pots since they hold the preamp board up. The controls are mounted and soldered directly to the board. The traces and solder pads are all small and lift REAL easy if you put your iron on them too long!
These circuit board mounted pots are the tiny ones with the 1/8" shaft, and several have a long DPDT switch on the back that's also soldered to the board. It's really easy to bend or break the shaft, particularly on the ones with the pull switch. There are two values used, 1 meg and 250k. Last time I needed one I found that although 1 meg is readily available I had a heckuva time finding a 250k. I was warned that they're not made anymore and I got the last couple I could find.
As long as you don't need much servicing beyond the usual re-tubing and biasing the Red Knob Twin can be just as good as any other, except for the gain channel as I had said. That's all taste anyway and maybe someone else would like it. Some folks like garlic on their Cheerios, too.
If you want some crunch I'd suggest using the clean channel with a decent pedal. Fender clean channels have always loved good pedals.
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